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HPI Baja 5B/5T
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Losi 5ive
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FG Modellsport
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R/C Engines
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R/C Cars
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Goped Scooters
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Goped
General Questions | Goped Maintenance Questions
Goped High Performance Questions |
Pocketbike Questions
FREQUENTLY ASKED QUESTIONS
If you don't find the answer you are looking for, send us an
email
and we will be glad to help with
your questions!
Yes, DDM is a direct
factory-authorized dealer or distributor for each of the following manufacturers and brands:
Patmont Motor Werks (PMW) - Goped brand scooters
Zenoah Engines
Walbro Carburetors
NGK Spark Plugs
HPI Racing R/C Products
FG Modellsport R/C Products
DDM is also a direct factory-authorized dealer for each of the following
smaller manufacturers:
ADA Racing - DarkSoul - Engine Trix - Earth Surfer Products - Extreme
Toys - GP Racing - Jet-Pro - KOS Products - Lightstream - MD Billet -
Outerwears - Proline
Racing - Pacific Sales - RamTech - Scooter Pros - Sikk Toys - TeamGoNads (TGN) - Trevor
Simpson - Turtle Racing - Vertigo Performance - Zero Error
We work directly with the best in order to bring you a wide variety of
products at unbeatable pricing.
GOPED GENERAL QUESTIONS
Is there a difference between a
Go-Ped® and other stand-up scooters?
You bet! You may have seen other scooters advertised as
'like' a genuine Go-Ped®. Don't be fooled. Patmont Motor Werks, manufacturer of all
Go-Peds®, has issued the following consumer warning :
"Inferior imitation products are being sold to unsuspecting
consumers by less than ethical resellers. This is being done by using our
Go-Ped®
trademark in web sites and elsewhere to call attention to and sell confusingly similar
products. This is referred to as "Bait and Switch". Don't be victimized by those
inferior products and tactics. IF IT DOESN'T SAY GO-PED®, IT'S NOT A
GO-PED®."
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The first
Go-Ped was created by Steve Patmont in Pleasanton, California, which
is also the founding location of Dave's Discount Motors. Genuine
Go-Peds are protected by several U.S. Patents, and and PMW recently won a lawsuit
against the manufacturers of a Go-Ped knock-off. In short: a Go-Ped is the original,
it is the genuine article, and in our opinion, simply the best stand-up scooter around!
Which Go-Ped model is right for me?
You will enjoy your Go-Pedding experience much more
if you use the right model for your size, riding style, and choice of terrain. In short,
The
Sport, SS Racers Kit,
and S25 are best suited for:
Average riders
Riders weighing 100 pounds or over
Riders looking for quick acceleration and
tight handling
All-around general use
The
GSR25 and GSR Sport
are
best suited for:
Riders
looking for a smooth ride
Making frequent stops and
starts
Cruising
The
GSR29R, GSR46R, and Super X-ped are best
suited for:
Riders looking for a
fast and aggressive ride
Jumping,
grinding and doing tricks
Advanced
riders
The
ESR750 and ESR750EX are best
suited for:
Smooth, air-cushioned ride
Ultra-quiet electric transportation
On-road use
The
GTR46, RIOT, and GTR Quad are best
suited for:
Smooth, air-cushioned ride
Jumping
Off-road or rough terrain use
All models handle hills and turns well. These are just general guidelines... you may find
you fit into several categories. For more insights onto which model is right for you, give
DDM a call at
801 619 0235
and we will be happy to answer any questions you may have!
What are the differences between
Goped
models?
Click here for a
comprehensive chart comparing the features of Goped scooters.
How
fast will my stock model Goped scooter
go?
The Sport, S25, GSR25, ESR750, ESR750EX, and GSR
Sport models all reach their top speeds at about 20 mph. The Super X-ped
and SS Racers Kit top out at about 25 mph.
The GSR29R, GRS46R, GTR46, and GTR Quad have a top speed of approx 30 mph.
Is my
Goped scooter legal to ride on public streets?
The laws vary greatly depending on where you
live. California
residents should be aware of the information found here.
In general, we recommend that you ask the law enforcement agency where you live for a specific
answer. It is the responsibility of every Goped rider to use good judgment
when
riding, and that includes making sure that we all obey the law!
If is is not legal to ride a Goped on the streets or sidewalks in your
town, you have a few options - either ride it on private property, or
ask the police where it would be OK to ride. If there are no laws
prohibiting Go-Pedding where you live, great! But now you have a
responsibility to be a good example of safe, defensive, courteous
Goped use. This sends a message to those who might want to restrict
the use of these great machines - 'Go-Pedders' are NOT crazy,
dangerous people that do stupid things like run stop signs and scare
pedestrians off the sidewalk. Go-pedding is a great pastime, so please
don't ruin it for those who can enjoy it responsibly. Please note also
that a Goped is not
equipped with reflectors, lights, and other features found on a bicycle. Nighttime riding
is therefore unsafe and DDM recommends that you avoid riding in traffic as well.
DDM makes NO CLAIMS as to the legality of operating Go-peds or other
motorized scooters in your area.
How long is the warranty on my
Goped scooter
Patmont Motor Werks covers all its products with a
90 day warranty.
What if I need to return a product?
No problem.
You can view a copy of our terms of sale
here.
All returns need to be accompanied by a completed product return
form.
You can download this form
here.
The return form requires
Adobe Acrobat to view -
download it for free here.
Does DDM match prices?
The manufacturer of all Goped brand scooters, Patmont Motor Werks, has implemented
a MAP (Minimum Advertised Price) policy. The prices shown on our
website conform to this policy. Call 801 619 0235 for a competitive
price quote over the phone.
DDM believes that
offering a fair price, great service, and providing extensive on-line
Go-ped resources is best for our customers.
Is assembly required when my
Goped
The Sport,
S25, Know-ped, GSR25, and GSR Sport all
come fully assembled and tested by the factory. The Super
X-ped, GTR46, GSR46R, and GSR29R will need to have the handlebar connected when it
arrives by tapping the plastic pin through the handlebar joint. The SS
Racers Kit requires full assembly.
Does DDM ship internationally?
Can I get
some free DDM stickers?
Sure :)
Send us a S.A.S.E.
(self-addressed, stamped envelope. This is an envelope with your return
address and a stamp on it. We will put the stickers in the envelope you
send and mail it back to you.) So, you need 2 envelopes with stamps:
1 large envelope addressed to:
DDM Sticker Request
228 West 12300 South, Suite 106
Draper, UT 84020
Inside this envelope, put another stamped envelope addressed to you. We
will put the stickers in this envelope and mail them back to you.
GOPED MAINTENANCE
GOPED HIGH PERFORMANCE
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There are lots of different engines available
for Goped scooters. How fast are they, and how can I choose the right one
for me?
On a Goped scooter, there are two ways to go faster:
1) Make your engine rev (spin) faster. This is generally accomplished with
high performance parts and high performance engines.
2) Go further with each spin (change your gearing). This is generally
accomplished by using bigger drive spindles, or using different drive
sprockets. However, there is a limit to how much you can increase your
gearing. Eventually, the motor is not strong enough to pull the additional
load - it's like trying to start your manual transmission car in 4th gear
from a dead stop.
For example, lets compare the CY23RC engine and the CY29RC engine. The
CY23RC is rated at 2.5 horsepower. The CY29RC is rated at 3.5 horsepower.
With stock gearing, both engines will give you about an equal top speed.
Why is the speed similar, when one engine is much more powerful? Because the
engines spin at about the same maximum revolutions per minute (RPM). But
wait... the CY29RC puts out more power - which means that it can handle
higher gearing than the CY23RC can handle. You can install a larger drive
spindle, or a larger front sprocket, on your CY29RC and go much faster.
Additionally, engines with higher horsepower will generally accelerate more
quickly.
The general rule of thumb should be: if you want to go fast, get an engine
with the most horsepower and 'gear it up'.
| Engine |
Brand |
Size |
Horsepower |
Recommended
Fuel Octane
(R+M/2) Method |
Recommended
Oil Ratio |
|
G23LH |
Zenoah |
22.5cc |
1.2 |
87 octane or higher |
40:1 |
|
G2D |
Zenoah |
22.5cc |
2.0 |
91
octane or higher |
40:1 |
|
G230RC |
Zenoah |
22.5 cc |
2.8 |
91 octane or higher |
25:1 |
|
G260RC |
Zenoah |
25.4cc |
3.0 |
91
octane or higher |
25:1 |
|
GZ25N14 |
Zenoah |
25.4cc |
1.4 |
87 octane or higher |
40:1 |
|
GZ25N23 |
Zenoah |
25.4cc |
1.5 |
87
octane or higher |
40:1 |
|
G43L |
Zenoah |
41.5cc |
2.5 |
87 octane or higher |
40:1 |
|
Modified
G43L |
Zenoah |
41.5cc |
3.5 |
87 octane or higher |
32:1 |
|
G62PU |
Zenoah |
61.5cc |
5.0 |
87
octane or higher |
25:1 |
|
CY23RC |
Chung Yang |
22.5cc |
2.5 |
91 octane or higher |
25:1 |
|
CY26RC |
Chung Yang |
25.4cc |
3.0 |
91
octane or higher |
25:1 |
|
CY27RC |
Chung Yang |
26.9cc |
3.25 |
91 octane or higher |
25:1 |
|
CY29RC |
Chung Yang |
28.9cc |
3.5 |
91
octane or higher |
25:1 |
|
GP290 |
Chung Yang |
28.5cc |
3.5 |
91
octane or higher |
25:1 |
|
GP420 |
Chung Yang |
41.5cc |
4+ |
91
octane or higher |
25:1 |
|
GP460 |
Chung Yang |
45.7cc |
4.2+ |
91
octane or higher |
25:1 |
| |
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Many engines require 91 octane (R+M/2 octane
rating method) or higher
gasoline. Where can I find it?
Using "Premium" pump gasoline is a good choice for these
engines. You can also purchase very high octane fuel at you local hobby shop
or motorcycle shop.
-
What improvements will I
see with high performance parts on my G23LH engine?
This engine comes on the Sport, Liquimatic,
Bigfoot, and X-ped. The following table should help you estimate what improvements in speed and acceleration you will
achieve with various high performance parts, as well as noise level impact
on your Go-ped. For info on how to find the speed of your ped, check lower
on this page.
|
Item
|
Top Speed
|
Acceleration
|
Noise level
|
|
Big-bore kit
(requires HP carb Kit) |
+3-4
mph |
faster |
slightly louder |
|
Rockit Key |
approx +1 mph |
slightly faster |
same |
| .675
Spindle |
+1-2
mph |
slightly
slower |
same |
| .750
Spindle |
+2-3
mph |
slower |
same |
| .800
spindle |
+3-4
mph |
much
slower |
same |
| .900 spindle |
+5-6 mph |
MUCH slower |
same |
| Ported Cylinder |
+2-3 mph |
faster |
same |
| HP Air
filter alone |
+
less than 1 mph |
same |
louder |
| HP Carb
Kit alone |
+1-2
mph |
slightly
faster |
slightly
louder |
| HP Carb
+ Air filter |
+2-3
mph |
faster |
louder |
| Tuned Pipe exhaust kit |
+2-3
mph |
slightly
faster |
louder |
| Exhaust
+ Carb + Air Filter |
+3-5
mph |
much
faster |
much
louder |
Complete
HP Kit
(spindle. air filter, carb, exhaust) |
+5-9
mph |
faster |
much
louder |
|
|
|
|
How do I change the drive spindle on my
Go-ped?
To install a new spindle,
1) remove the rear wheel and move the gas tank out of your way
2) remove the bolt in the center of the old spindle
3) spray a little WD-40 or other loosening agent where the bolt used to be.
4) set the Go-ped on its side to let the oil soak down in for about 10 minutes.
5) Give the old spindle a few light taps with a hammer as you pull on it. Pull hard, and
it will come off! If you are really having a hard time getting it off, try using the
narrow end of a hammer as a 'crowbar'. Place it under the end of the spindle, and tap on
the hammer head to pop the spindle off.
6) Put the new spindle on, and tap it into place.
7) put the spindle bolt back in and tighten it very firmly. You may
want to grip the new spindle with a pair of vice-grip pliers to allow
you to tighten the allen bolt all the way.
All done! Put your gas tank back in place and replace the rear wheel, and you are good to
go!
You can also
purchase a
spindle removal tool here which makes the process much easier.
How much power does my engine have?
Check out some dyno results from the Zenoah factory for the engines below:
How do I change the front sprocket on my GSR25 / GSR26R / GSR29R / GSR
Sport / GSR40 / GSR40-TS / Go-Bike / GTR40 / GTR46 / SGSR42R / SGSR46R / Quad 25 / Quad 30 / Quad 40
/ Quad 46 / GTR Quad / RIOT?
To install a new
front sprocket:
Remove any items which block your access to the sprocket. Remove the
chain.
Once you have clear access to the sprocket, spin the sprocket and you
will see gaps in the clutch behind the aluminum clutch surface. Take a
thin allen wrench, nail, or other long object and slide it onto the hole
in the clutch to stop the clutch from spinning. Now, grab the old
sprocket with a pair of pliers and unscrew the sprocket counterclockwise
(it is a regular right-hand thread, so 'righty-tighty, lefty-loosey').
After you have removed the old sprocket, twist the new sprocket in
firmly. You don't have to over-tighten the new sprocket - the engine
will continually tighten it against the chain. Remove the allen wrench
or nail, re-thread the chain, and re-install any parts you removed..
You can also purchase a sprocket tool which makes this process easier.
How do I install the
G23LH HP Carburetor (Walbro WA-167) Kit?
Installation
instructions for the G23LH HP Carburetor Kit that DDM sells can be downloaded
here:
HP Carb Installation Instructions
How do I install the Rockit
Key on a G23LH Engine?
Quick and easy instructions to
install this part:
Take off your fan cover by removing the screws holding it on. Now, take
off the nut that holds the flywheel on. You will need a 12mm socket for
this. Twist a M6 size metric bolt into one of the threaded holes in the
flywheel until the bolt is all the way down against the crankcase. Now,
tighten the bolt slowly to lift the flywheel off. You can tap the flywheel
with a rubber mallet to help it pop off. Take the bolt out of the
flywheel, and turn the crankshaft until your stock flywheel key is
located at the top. Remove this stock key with a screwdriver or other fine
instrument. Insert your rockit key into the space in the crankshaft. Be
sure the offset is facing the same way the flywheels spins. It is important that
the key sits all the way down in its slot. If you are having a hard time
getting it to fit, try some light sanding of the key with abrasive
cloth. Next, replace your flywheel. Be sure that the rockit key stays in
place as you replace the flywheel, and that the key lines up with the
keyway in the flywheel. Press the flywheel on firmly. Replace the retaining nut and tighten
it firmly. Re-install your fan cover, and enjoy the increased power and
better fuel burn that results from properly advancing the timing! You
may want to check your flywheel nut after a few minutes of use to ensure
it is tight.
- How should I adjust the
jets on a Walbro Carburetor (WA-167 / WT-603 / WT-668 / WT-257 / WT-813, etc)?
These carburetors require regular adjustment to ensure peak
performance, and also to avoid an unsafe lean condition, which can prematurely
damage your engine. If
you find your top-end RPM's have fallen off a bit, or if you
experience lagging or surging, it is probably time to re-adjust the
carb jets. To ensure max performance and engine life, follow this
procedure:
1) Locate the low and high RPM jets on the side of the carb -
they are usually marked with a L and a H. Turn both jets completely CLOCKWISE
( to the fully closed position).
2) Rotate the Low jet counter-clockwise to 1 and 1/4 turns
open.
3) Rotate the High jet counter-clockwise to approx 1 and 3/8 turns open.
4) Now, start the engine. You may need to turn the Low jet
slightly one way or the other for the engine to start.
5) Adjust the Low jet as desired until the idle is where you
like it. Turning clockwise ("CLOSING" THE JET) will
produce a higher idle, and counterclockwise ("OPENING" THE
JET) will produce a lower idle (and eventually flood and the engine
will kill, if you turn it too far).
6) Open the throttle
lever to full blast. Adjust the High jet until you get maximum RPMs.
Note: this will probably be REALLY LOUD. Listen for the highest-pitched whine to tell
you where max RPMs are hit.
AFTER
YOU FIND THE MAX RPM SETTING, TURN THE HIGH JET COUNTER-CLOCKWISE
("OPEN" THE JET) APPROX 1/16TH OF A TURN TO ENSURE YOU HAVE
SUFFICIENT GAS/OIL MIX TO COOL THE ENGINE PROPERLY.
Note: The above are just general guidelines. You may need to adjust both the H
and L screws once you begin riding, depending on engine loading, altitude,
humidity, etc. The trick is to find settings that work well for you, and stick
with them.
Here is some helpful information regarding common carburetor tuning
problems:
If your engine
stutters at full throttle and cannot reach full RPMs:
The high jet is too far open. Close the jet by turning it
clockwise slightly, and then ride-test. If no improvement, repeat until
desired results are achieved. Once you have found a workable setting, open the
jet approx 1/16 of a turn to ensure sufficient fuel/air mix.
If your engine
bogs out when transitioning from low speed:
The high jet is too far closed. Open the jet by turning it counterclockwise
until you are at least 1 1/2 turns open, and then gradually close the jet
until performance is as desired. Poor engine compression, blocked exhausts,
and very heavy engine loading can all also cause bogging.
If your engine idles very fast and kills if you attempt to slow the idle:
You may have an air leak in your intake. An easy way to check for leaks is to
spray the intake manifold and area surrounding it with WD-40. If the idle
changes after you spray the WD-40, there is an air leak. Common areas for
leaks are between the manifold and the cylinder, and between the carb and the
intake manifold. Inspect the manifold, carb gasket, and intake gasket for
cracks or other signs of damage, and replace if necessary.
If your engine idles but then slowly kills:
Your low jet is too far open. Close the low jet by turning it clockwise until
a stable idle is achieved.
-
What are the recommended carburetor needle settings for my engine?
DDM recommends the following tuning as a STARTING POINT for tuning your
engine:
G230RC / G260RC / CY23RC / CY26RC / CY27RC / CY29RC / GP290 engines: 1 and 1/4
L, 1 and 3/8 H.
GP420 / GP460 engine: 1 and 1/4 L, 2 and 1/2 H.
- What Spark plugs will work
in my
Zenoah or Chung Yang RC-style
engine? What electrode gap is correct?
For the Zenoah RC-style engines and clones, the following plugs work well:
Champion R27C
NGK CR8HVX
NGK CR8HSA
NGK CR7HVX
NGK CR7HSA
NGK CMR8A
NGK CMR7A
This plug works the BEST:
NGK CR8HIX Iridium
Plug
A gap of .65mm (.029 inches) is recommended.
- How should I install a new big-bore kit on my
Zenoah or Chung Yang RC-style
engine?
Here are some basic instructions to help you install a new
big-bore kit or replacement top end for your motor:
1) Remove all outer engine parts from your current engine - remove the
airfilter, carburetor and intake manifold; remove the engine shroud and
ignition coil, disconnect the muffler, etc. The cylinder should now be bare
with nothing attached to it.
2) Remove the cylinder by removing the bolts holding it to the crankcase.
Gently slide the cylinder up and off. Remove the old cylinder gasket.
3) Separate the piston from the crankshaft. Remove the c-clips which hold the
piston on the piston pin and bearing. Slide the piston off, and remove the
piston pin, washers, and pin bearing if your kit includes new ones.
4) Put the piston ring on your new piston. Slide it down over the top. Be
careful not to bend the ring or it may break. Make sure the gap in the piston
ring is aligned with the little nub in the piston ring groove on the piston.
5) Re-connect the piston to the crankshaft. Make sure the arrow or dot on the
piston is toward the exhaust (not intake) side of the engine. Make sure you
have the pin washers at both sides of the piston pin. Install the c-clips at
both sides to ensure the piston is securely attached. Make sure these clips
snap securely into their grooves.
6) Place the new cylinder gasket on the crankcase. Slide your new cylinder
down over the piston and ring. You may need to compress the piston ring
slightly to get the cylinder on. Again, make sure the gap in the ring is
aligned with the little nub in the piston ring groove. Slide the cylinder down
slowly and smoothly. Try not to wiggle or twist it too much to avoid scoring
the cylinder.
7) Reconnect the cylinder to the crankcase. Tighten the bolts firmly.
8) Reinstall the carb, filter, muffler, shroud, coil, etc removed in step 1.
When reinstalling the ignition coil, place a business card between the coil
and the flywheel. Turn the flywheel so that the magnets pull the coil and
flywheel together, pinching the card. Now, tighten the ignition coil bolts.
This will ensure you have a proper gap between the coil and flywheel.
9) Once all parts are reinstalled, fire up your new engine and enjoy your new,
more powerful machine! Be sure to heat-cycle the engine several times (run the
engine for a few minutes at a low, varied throttle, turn it off and allow to
cool, then repeat) in order to allow the new parts to properly seat
themselves.
- How should I break-in my
Zenoah or Chung Yang RC-style engine?
Zenoah RC-style engines and clones are tuned for
high performance and need to be well taken care of. Breaking-in an engine is
a process of alternately heating and cooling the engine to allow all parts to
properly seat themselves, and allowing 2-stroke oil from the incoming fuel to
coat the interior of the engine. DDM recommends the
following break-in procedure:
Use 91 octane or higher fuel, mixed 25:1 with a quality non-synthetic 2-stroke
oil. (You can use synthetic oil for break-in also. Just run slightly
more fuel through the engine. ) Run the engine at varying speeds for periods of
3 to 10 minutes at a time. During
this break-in time, NEVER go full throttle. Always let the engine idle for 30
seconds before turning it off. Allow the engine to cool off for 10 minutes
before starting it again. Repeat this process 3 or 4 times - 3 or 4 full "heat
cycles".
After the break-in period, switch to a high-quality synthetic 2-stroke oil,
mixed at 25:1. Be sure to let the engine idle for 30 seconds to cool
before stopping. Be sure to follow the maintenance schedule included in your
engine owners manual.
- Help! My
Zenoah or Chung Yang RC-style
engine won't start! What's wrong?
This engine is tuned for
high performance and needs to be well taken care of. If your engine won't
start, check the following things:
1) Are you using high octane gasoline? 91 octane or higher is needed.
Using octane booster is not recommended.
2) Are you using high-quality 2-stroke oil mixed at 25:1? This is 5
ounces of oil per gallon. DO NOT USE
any oil labeled as 'TCW-3', 'MARINE' or 'OUTBOARD' oil. These are
designed for low-revving, water-cooled oil-injected motors (such as personal watercraft), and your
engine will likely not run well if you use them.
3) Are you using the choke properly? On the side of the carburetor
there is often a choke lever. Horizontal is open, vertical is closed. Lever should be
closed when first starting. As soon as the engine sputters at all, move the
choke to open and leave it there.
4) Is your spark plug clean and working? Remove the plug from the engine
and inspect the tip. Is it clogged with gunk or debris? Clean if necessary.
After the plug is removed, check if the plug is working by: attaching the wire
to the top of the plug, and place the tip of the plug very close to the metal
of the cylinder. Pull the pull start a few times. A spark should jump from the
plug to the cylinder. If no spark or weak spark, replace the plug, ensure the ignition coil
and flywheel are properly gapped, then check again. If still
no spark - you likely have a problem with the ignition coil, and will need
professional service.
5) Is your carburetor properly tuned? Rotate the 'H' and 'L' screws on
the side of the carb fully clockwise ('closed'). Then, turn the L screw
counterclockwise ('open') 1 and 1/4 turns. Turn the H screw open 1 and 3/8
turns. You may need to adjust these screws slightly in either direction to
find correct tuning for your carb.
6) Is your engine flooded? If you have pushed the primer bulb a lot of
times, or pulled the pull start a lot of times, the engine may be flooded.
Remove the spark plug, and allow all the fuel in the cylinder to evaporate.
You can speed up this process by blowing on it with a hair dryer.
7) Are you getting good compression? If you have used your engine for
an extended period of time, the piston ring may need replacement. See
instructions below.
8) Do you have a gasket leak? Check your carb gasket, intake gasket, cylinder gasket,
and crankcase gasket. Can you hear air whooshing out of the cylinder gasket or
crankcase gasket when you pull the starter? Is air leaking in the manifold
gasket behind the carb? A gasket leak results in a loss of compression and/or
improperly mixed fuel and air.
An easy way to check for intake leaks is to spray the intake manifold and area
surrounding it with WD-40. If the idle changes after you spray the WD-40,
there is an intake air leak. Common areas for leaks are between the manifold
and the cylinder, and between the carb and the intake manifold. Inspect the
manifold, carb gasket, and intake gasket for cracks or other signs of damage,
and replace if necessary.
If your engine still won't start, you will likely need professional service on
your engine.
- How do I change the
Zenoah or Chung Yang RC-style
piston ring?
If your engine is losing compression, the ring may need replacing. Here's how:
Remove your air filter, carburetor and muffler. Remove the fan cover and the
engine cover. Remove the ignition coil, and then remove the two cylinder
bolts. Keep them safe. Remove the cylinder by pulling firmly upwards. Do not
rotate, twist, or bend the cylinder, or slide it up and down. Remove the old
ring by carefully breaking it off, or bending it and pulling it off the top of
the piston. Try to avoid touching the piston or inside cylinder with your bare hands
- your body oils or other foreign matter on your hands may harm the engine... you may want to consider wearing clean
latex gloves. Now, carefully
install the new ring by bending it over the top of the piston. You can put the
ring in the oven at 200°
for a few minutes to warm it up and make it less likely to crack during
installation. Place a drop or two of 2-stroke oil on the edge of the ring. You
can also put in a new base gasket now if your current gasket needs replacing.
Slide the cylinder back on smoothly (no twisting or up and down) and replace
the cylinder bolts. Re-install the ignition coil, engine cover and fan cover,
muffler, carb, and filter. Follow the break-in instructions above to allow the
new ring to seat itself well.
- What chain lube should I
use on my chain-driven Goped scooter?
DDM highly recommends top-quality PJ1 chain lubricant.
- How does a tuned pipe exhaust
work? Why will it
increase the performance of my engine?
A "tuned pipe" is the common name for a Helmholtz resonator. An
example you are probably more familiar with is an organ pipe, which resonates
or is "tuned" to a particular frequency. 2-stroke engines also make
a sound wave with a particular frequency. As the RPM's of your engine get
higher, the pulses of exhaust gas coming out of your engine bounce back and
forth inside the pipe and create a "standing wave". Areas of high and low
pressure are created. The exhaust is sucked quickly out of the low pressure
areas. Tuned pipes create a low pressure area directly behind the
cylinder, and exhaust is sucked quickly out of the cylinder! This makes more
room for fresh air and fuel, and thus: more power for your ped. Additionally,
return waves help push back incoming fuel/air mix, keeping it in the cylinder
to be burned. This is why
tuned pipes are an excellent investment, despite the cost. Other systems, such
as aftermarket mufflers with two exhaust tubes, simply reduce the back
pressure from the muffler. They cannot create a standing wave which leads to
low pressure at the exhaust port.
- How can I tell how fast my Goped
or Pocketbike is?
The only accurate way to
measure your scooter or pocketbike speed is: use a speed trap. It is the only foolproof,
accurate method of judging speed. All official speed records are measured this
way. Here's how a simple speed trap works:
We want to find out how many feet per second you are traveling. This is
easy to do.
Measure off a known distance on a street (at least 200 feet). 300 or
more feet is better and will be more accurate. Mark a start line
and a finish line.
Now, get a long running start from further down the street, so you are going
FULL SPEED on your vehicle when you cross the start line.
With a stopwatch, have someone time how long it takes you to travel from the
start line to the finish. This is best accomplished as follows:
Have the person with the stopwatch stand at the start line, and start the
timer when you cross the line. Have another person with a flag or something
stand at the finish line. When the scooter crosses the finish line, quickly
lower the flag. The person with the stopwatch should stop the timer when the
flag is lowered.
Let's say it took you 5.4 seconds.
This means that you were going (200 feet / 5.4 seconds) = 37 feet per second.
But how many MPH is that?
There are 60 seconds in a minute and 60 minutes in an hour, so there are (60 *
60) = 3600 seconds in an hour.
This means you were going (37 feet/sec * 3600 sec/hour) = 133,200 feet per
hour.
Almost there...
There are 5,280 feet in a mile, so you were going (133,200 / 5280) = 25.2 MPH.
Not bad!
The general formula for finding MPH from Feet Per Second is: FPS * .682 = MPH.
POCKETBIKE
FAQ
-
How can I tell what kind of engine is in my
pocketbike?
Most pocketbikes use 2-stroke engines.
There are two different types of 2-stroke engines in use on pocketbikes:
These engines are used on '47cc' pocketbikes. The
carburetor connects to the crankcase. These engines generally have
a 40mm cylinder (for an actual engine size of 40.2cc) or a 44mm
cylinder (for an actual engine size of 48.7cc). |
Piston Port Engine
These engines are used mainly on the larger
'49cc' midbikes & superbikes (cateye, X1, X2, 380x, R1, X7,
etc). Here, the carburetor connects to the
cylinder.
|
How do I install the Rockit
Key on a pocketbike engine?
Note: if you are installing a rockit key in a 47cc pocketbike, please
refer to the following illustration: (For 49cc bikes the direction of
rotation is the opposite)
Correct installation of a rocket key will always be with the offset
pointing in the direction of flywheel rotation.
- What spark plugs will work
in my pocketbike engine?
For both 47cc and 49cc pocketbikes, the following plugs work well:
Champion CJ6, CJ8, CJ6Y,
CJ8Y
NGK BM6A, BM7A, BPM6A, BPM7A
Autolite 253, 254, 255
- Where can I get more technical
information on Pocketbikes?
Pocketbike Planet (
www.pocketbikeplanet.com ) is a
great resource for pocketbike enthusiasts. Here are some links to relevant
forums:
47cc
Pocketbike Performance Tips and How-To's
- How should I break-in my
pocketbike engine?
Breaking-in an engine is
a process of alternately heating and cooling the engine to allow all parts to
properly seat themselves, and allowing 2-stroke oil from the incoming fuel to
coat the interior of the engine. DDM recommends the
following break-in procedure:
Use premium fuel, mixed 25:1 with a
quality non-synthetic 2-stroke oil. (You can use synthetic oil for
break-in also. Just run 2-3 tanks instead of 1-2. ) Run 1 to 2 tanks of gas through the
engine, running the engine at varying speeds for periods of 5 to 15 minutes at a time. During
this break-in time, NEVER go full throttle. Always let the engine idle for 30
seconds before turning it off.
After the break-in period, switch to a high-quality synthetic 2-stroke oil,
mixed at 25:1. Be sure to let the engine idle for 30 seconds to cool
before stopping. Be sure to follow the maintenance schedule included in your
engine owners manual.
- What chain lube should I use on
my pocketbike?
DDM highly recommends top-quality PJ1 chain lubricant
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click here
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