how to gas scooter troubleshoot can save you money We show you how, and
where to go for gas scooter tools
Shooting Reference for Gas Powered Scooters
page is provided to help you find and repair problems
associated with gasscooters and is not intended to replace your
repair manual. To successfully use this guide you will be
taught how to identify the major problem with your scooter, and
then use the guide to make the diagnosis and repair. I have
listed the most likely causes first to help you quickly get your
gas scooter back on the road. You may find it beneficial to
read an excellent article on gas
scooter clutches and transmissions first. If you are
looking to resolve an engine problem try Troubleshooting
gas scooter Engine
Maintenance, disassembly and repair of your gas powered scooter
should only be performed by people with sufficient mechanical
skill or experience so that no unsafe repair or modifications are
Scooter Moves When Engine Is Idling:
problem can be a safety issue as well as a maintenance challenge and should be
addressed very quickly.
idle creeping is caused by an engine idle setting that is set too
high. Reasons typically include a kinked throttle cable (gently
straighten the kink) or a binding throttle cable (try to work some WD-40 in
the cable sleeve). You need to also check that the throttle linkage at
the engine is not binding. With the engine off, gently try the linkage
with your fingers while holding the twist grip in full throttle
position. Engines also have an idle screw, but if you have not messed
with the setting, this wouldn't change. Observe if the throttle
linkage is resting on the idle stop though. You can try spraying the
cold scooter with a carburetor cleaner and let it soak a few hours if it's
possible the drive chain is too tight and is putting enough side load on the
clutch to cause it to partially engage. Make sure your chain is well
lubricated and is not too tight or binding anywhere. I have seen this
happen where a piece of new chain was put into repair an old chain. At
certain positions the chain would be tight, and at others loose.
gas scooter takes off by itself when the engine is started, that is an indication that the clutch is badly in
need of lubrication. It's very possible
that your centrifugal clutch is overheated or not oiled properly. See
a full discussion below under the heading Erratic Engagement of
Turn the engine off and park the machine up against a
tree or fence to prevent it from taking off when you crank the engine again.
You can also put the rear end up on centerblocks so the rear wheel is not
touching the ground. Lubricate as needed. Give the lube enough time to
penetrate, then start the engine. If the machine continues to take off by
itself even after the clutch has been oiled, the clutch is burned up and
must be replaced.
Engagement of Clutch
described in gas scooter clutches
and transmissions your gas scooter clutch is has several moving parts that
must operate in concert with each other if your gas powered scooter is to
function correctly. Several things can cause a centrifugal clutch to grab
or slip unexpectedly.
- The clutch consists of three parts:
The center shaft and weights spin as one. If
they are spinning slowly enough, the weights are held against the shaft by
the spring. If the engine spins fast enough, however, the centrifugal
force on the weights overcomes the force being applied by the spring,
and the weights are slung outward. They come in contact with the inside of
the drum and the drum starts to spin. The drum, weights and center shaft
become a single spinning unit because of the friction between the weights
and the drum. Once the drum starts turning, so does the chain.
- An outer drum that turns freely - This
drum includes a sprocket that engages the chain. When the drum turns,
the chain turns.
- A center shaft attached directly to the
engine's crankshaft - If the engine is turning, so is the shaft.
- A pair of cylindrical clutch weights
attached to the center shaft, along with a spring that keeps them
retracted against the shaft
Oil the bushing that is located in the sprocket at least every two (2)
hours of driving time. Where do you oil it? Right where you see the snap
ring on the sprocket at the end of the clutch. There is a bronze bushing
behind the snap ring that needs lubrication. With the engine off, squirt
several drops of oil while the bushing is warm. At the same time lube the
chain. Use a good motorcycle chain lube. Once the
chain gets "kinky" from lack of oil it should be replaced before
it does damage to the clutch sprocket. A new chain is cheaper than a new
clutch. If you keep the clutch and chain lubricated you should get years out
of both. Oiling the chain after it gets dried out is a waste of time.
Remember it is preventive maintenance, which means before the items get
Don't put oil inside the clutch. The holes on the drum of the clutch
are to let the hot air out of the clutch. DON'T SQUIRT OIL IN THESE HOLES!!
When oil gets in the drum portion of the clutch it will cause excessive
slippage, which means undue heat will be generated.
If your gas scooter has a grease fitting in the crankshaft for lubrication
then a shot of grease twice a month should be sufficient lubrication. The
grease is coming from the inside of the sprocket outward, which is a better
way to lubricate the clutch. The keyway in the crankshaft acts as a
reservoir for the grease, which cuts down on the frequency needed for
maintenance compared to oiling the snap ring area. Dirt and sand will wear the chain as well as the
sprockets so do not overdo.
to make sure that the chain is not too tight and be sure that the brakes
release freely when not engaged. Check them by lifting first the front
then the back tires in the air and have someone spin the tires to see if the
brakes are indeed dragging. If they drag when the scooter is cold,
they will heat up and grab when the gas scooter gets hot.
Driving too slowly: A
centrifugal gas scooter clutch starts to engage around 2,000 rpm and will lock up around 2,600
rpm. It would seem just the opposite but driving at speeds that allow the clutch to fully engage gives the
clutch a chance to cool down. When the clutch is allowed to fully engage at
high RPM it
locks the shoes in the clutch against the drum and no slippage occurs. When the clutch is not
locked up, the shoes can slip against the drum which causes heat that can
dry up the lubrication in the oil impregnated bronze bushing. The
tremendous amount of heat generated can also anneal (soften up) the clutch
shoe return spring which is the
heart of the clutch. If the shoes turn a blue-purple color from excessive
heat, it's more than likely the clutch is ruined and the spring no longer
has the ability to pull back the shoes at idle.
Changing the size of the
gas scooter tires. Putting on tires that are larger than
what came with the scooter will result in clutch problems. Tires exceeding
13" in diameter stress out a clutch if the gas powered scooter is not properly geared
for the larger tires. If you are driving on smooth flat terrain than you may
be able to get by with larger tires but once you get on hilly terrain,
deep grass, then you are putting additional strain on the clutch, which will
cause premature wear. Generally
this is not such a big issue, since gas scooter frames rarely accommodate a
larger tire. But, it means that if you ever replace your gas scooter
clutch, you have to make sure you get a clutch that is rated for your
particular scooter and tire size.
Weight: A centrifugal clutch is designed to be able to move a certain
amount of weight. Once the weight limit is exceeded, then the life of the
clutch will be shortened. A good rule of thumb is the scooter and driver
should not exceed 250 pounds. The gas scooter weighs around 50 pounds so add to this the driver
. If you know ahead of time that you will exceed the 300 pounds then buy a torque converter
gas scooter and avoid the problems of
burning up the clutch asking it to do more than it was designed for. A
torque converter has a variable speed system between the driver and the
driven pulleys so it can improve the gear ratio when climbing hills, which gives the torque
converter an advantage over a straight clutch system. It improves the ratio
by approximately 3:1 and can turn larger tires and drive at slower speeds
without doing any damage to the clutch system. A torque converter is a more
expensive system initially but it will last longer and is more trouble free
Restrictors: Do not try and reduce a gas scooters speed by limiting the
travel of the throttle or by putting a restrictor in the carburetor to
limit full rpm. Either of these methods will result in the clutch slipping,
which is self-destructive. A gas scooter clutch needs full rpm to lock up as quickly as
possible to be able to start to cool down.
to Remove an Old Clutch
Always make sure all the pieces of the old clutch are removed from the
crankshaft before attempting to install a new clutch It is not uncommon to think all of the old clutch has been
removed when it hasn't.
If your crankshaft is rusty, clean the end of the crankshaft with a wire
brush. You should be able to see the end of the keyway cut into the
crankshaft. Dig as much rust as you can out of the keyway and spray some
penetrating oil between the clutch hub and the crankshaft. There are often
one or two set screws in the clutch hub, near the engine and perpendicular
to the crankshaft, which bind the hub to the shaft. Remove them if they are
present. If your clutch is in pieces coming off and being difficult to
remove completely, disassemble all the pieces from the clutch hub. Once all
the other pieces have been removed you should be able to get a grip on the
clutch hub with a gear puller and pull it off (don't forget to use
penetrating oil). Be sure to put a bolt in the end of the crank to protect
the threads inside. If you don't have one, you can rent a gear puller from
an auto-parts store for around $10.00 to $20.00 a day.
If a gear puller won't work you will have the cut the clutch hub off
without damaging the crankshaft or oil seal. A cutting torch will most
certainly burn your oil seal, so replace the oil seal if you use heat. A
high-speed die-grinder with a thin abrasive disk cutting wheel is one
possible tool to use in this situation. Score a deep gouge in the thick
part of the clutch hub, parallel to the crankshaft, being careful not to cut
all the way to the crank. Then use a blunt chisel and a hammer to break the
clutch hub along the score line. This loosens the hub enough that it comes
off easily with a puller.
try to answer all your questions in the
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GAS SCOOTER PARTS?
get mine from Neo
Scooters. What you see below are actual pictures from their
parts catalog. No more guessing if you have the right part by an
obscure description. They sort by the model of your scooter and
have pictures of each part, with the price and part number. With
Free Shipping Included, you cannot go wrong. Look for their
parts link in the lower left corner of the page the link
above on the Neo logo) takes you to.
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