Maintenance Tips:
SCOOTER MAINTENANCE
and ASSEMBLY
Troubleshooting
Guide for 4-Stroke Motor Scooters.
Troubleshooting
Guide for Stand Up Gas Scooters.
SCOOTER
MAINTENANCE
(Stand up gas scooters)
Rear tire repair
Images
Exploded
view
of Transmission
Exploded view of
Engine
Gasoline / Oil Mixture
Synthetic oils are the best to use in your scooter, along with a
standard grade octane pump gas.
A word on engine oil: 32: 1 is
the recommended mixture ratio. This ratio is dependant on the quality
of 2-cycle premix oil used.
TIP: If using a high-quality synthetic oil such as Maxima Castor
927 mix at a 40:1 ratio for best performance.
Changing Transmission Oil
Remove the top nut from transmission, turn upside down to drain, add
180cc of 85-90w synthetic gear oil - available at most auto parts
stores.
It is recommended to change the gear oil every year.
Tire pressure
30 to 35 PSI
The rear tire tube valve is a little tricky to get to. The easiest
method is to pull the valve over with a screwdriver and then
thread on a valve extension (available at any auto parts store). Adjust
air pressure as necessary and then remove valve extension.
Spark Plug Gap
Spark plug gap : .024-.028 inches (.60-.70 mm)
Chain
It is always wise to use a good motorcycle chain lube such as PJ1 or Maxima
Chain Wax.
Steering Column Adjustment
To tighten: Loosen small set screw on top nut, take big cresent
wrench and turn nut clockwise. Be careful not to over tighten. Lift the
front of the scooter off the ground. Push the handle bar in one
direction or the other. It should swing freely. If it just stops and
doesn't swing in one direction then back again it is to tight. To see
if it is to lose: kneel in front of scooter, pick up front end of
scooter by the fork with one hand, grab the steering column below the
release post with the other hand and rock back and forth. You should
not feel any play. If you do tighten as instructed above.
Carburetor Adjustment
The small gold screw on the side of the carb is the idle speed
screw. This screw controls the idle speed, the tip should extend about
an 1/8 of an inch(4 mm). Adjust it so the engine will idle at just fast
enough speed to stay running.
The black screw located lower on the side of the carb next to
the choke lever is for the high speed mixture. Start by turning this
screw in(clockwise)
until it stops. Don't turn it in tight, just until it stops. Next, turn
the screw out two full
turns(counter-clockwise). This is the factory setting. You should be
able to start and operate the
scooter with this setting. Once you have it running, you can fine tune.
Never turn the screw more
than an 1/8 of a turn at a time. Try turning it IN about an 1/8, this
will help the top speed
operation. BUT, turning it in TOO MUCH will cause the motor to run lean
at full speed and can
burn a piston. Also, running too lean will cause a loss of low end
power. Once you get the
mixture set you can adjust the idle, it should be low enough that the
engine doesn't vibrate.
Finally make sure you have the choke lever down completely after the
scooter is started and
warmed up.
There is also a main jet adjustment screw dead
center on the top of the carburetor. This is most always set at 1 full
turn out.
If this is not adjusted correctly, your scooter may not run, or run
very poorly. Once again, turn screw all the way in (clockwise) and then
out (counter-clockwise) 360 degrees (1 full turn).
Trouble-shooting
gas scooters
Things to check for
My scooter is not charging (For Electric Start models only)
- Look
for charger light(s) changes when plug into scooter jack. It should
flash or change color.
- Make
sure the fuse in scooter is good.
-
Check the wires behind the fuse holder and the charging jack. Sometimes
they come loose.
My scooter wont start.
- Make
sure you have fuel getting to the carb
- Make
sure you choke is off (up position) when the engine is cold.
- Check
the spark plug for sign of wear and tear
- Try
using starting fluid to aid the starting proccess. spray a little into
the carb.
- If it
starts by spraying starting fluid and dies as soon it runs out of
starting fluid then this means there is no fuel getting to the engine.
check the carb.
- Or
there might be vaccum leak in the piston area. If your piston is badly
scratch up due to the lack of oil, then you need to replace piston and
rings to compression back.
My scooter is hard
to start
- Is
the fuel mixture done correctly? (25to1 or 4oz/gallon) Too much oil in
the mixture will make it harder to burn.
- Is
the spark plug dirty? Clean or replace it if its dirty
- Make
sure the carburator and the intake manifold are tightly secured to the
engine.
- Check
the gasket between the carb and intake manifold. Sometimes the gasket
is bad and caused leak. Solution: replace new gasket or just toss the
bad gasket away and screw carb back. now try to start again.
Scooter bogs out
when I turn the throttle.
- Adjust
the screw with the spring on the side of the carb. clockwise to reduce
gas flow and counterclockwise to allow more gas follow. Usually bogged
down is caused too much gas going thru the carb.
- Give
time for it to warm up.
- If
that doesnt solved the problem, you need a new carb.
My scooter is
leaking oil from the Carburator and Muffler areas
- Your
gas mixture is too rich and you need to reduce the amount of oil a
little.
- check
the gasket between the carb and intake manifold. it might be bad or
maybe the carb came loose due to engine vibration.
I keep breaking the pull start.
- You
should pull the pull start cord out a little until you feel the tension
then give a good more the side of your scooter not front. pull smooth
...jerking motion can damaging internal part of the pull start or
breaking the cord.
- Add
wax to the cord sometimes help
My electric start wont work.
- Make
sure the squeeze the left handle brake while pressing the electric
button.
- When
the electric start make clicking noise ..it means your battery is weak
- Check
the fuse.
- Is
your key switch good?
- Is the
electric start by the pull start giving out a burnt smell?..you might
have a burnt out electric start. sometimes there is no smell.
My engine froze.
- hmmm.
scream!!!....The cause is lack of oil getting to the piston and needle
bearing areas. Certain oil cant cling on when the engine get too hot.
As a result, the needle bearing fell apart inside and caused the engine
to cease. you can buy a new a engine or try to rebuild it.
The engine mount screw(s) broke off.
How do I adjust my brakes?
- Brakes
can be tighten by the handbrake area by the handlebar or by the wheel
area.
My scooter is not
holding its charge.
- Using
the headlight and electric start too much will drain the battery.
- Gas
scooter does have the ability to charge itself but slowly. An optional
charger can be bought for $25.
- Most
new scooters would have a full charge and it would be display on the
battery gauge. But in time, the batteries would loose their ability to
hold a full charge. That's normal!
-
Sometimes charging the batteries too much even when they are not low.
Most of these batteries charging cycle are around 250-300 times.
- Sometimes
store your scooter away for a long period would cause that as well. If
the battery power drops beyond a certain point, the charger would not
recognize it. Sometimes you could jump start the batteries by using a
higher Amp charger.
My scooter chain
keeps falling off when I am riding it
- The
chain might be loose and need to be tighten by first loosening the axle
outer nuts and then tighten up the axle adjusters on each side. After
the chain is tighten, go ahead and tighten the axle nuts.
- The
wheel and motor sprockets are not properly aligned. check to see if the
chain is straight from the rear wheel sprocket and the motor sprocket.
It not, then follow the above procedure to get the chain lines up
correctly.
- Sometimes
if the bearing(s) goes bad in the rear wheel. The wheel will tilt at a
strange angle causing the chain to come off easily.
ATTENTION RIDER!!!
Routine check ups
- Make
sure all loose parts are tighten before each ride. (such as the neck of
the handle bar, wheels, seat post, brakes, and ESPECIALLY engine mount
screws)
- Make
sure tires are fully and well inflated.
Not Recommended
- Avoid
jumping off of curves
- Too
much weight on scooter can bend or break the frame.
- Do Not
ride on a flat tire. This will damage the tire and possibly the wheel
as well.
| 
