Your scooter uses a 2 stroke engine for power.
A two stroke engine was chosen for it's excellent power to weight
ratio. A two stroke engine does not require that you ever change
the oil, however it does require that you mix a quality grade
2 stroke oil with the gasoline prior to filling your scooters
gas tank. This ensures that your engine will remain lubricated
and give you reliable service.
To accomplish this you can buy 2 stroke oil at almost any auto
parts store or hardware store. The oil and gas are the mixed
together in a separate container before filling the scooter.
The mixture should be done at a 25:1 ratio (See ratio chart
below). mixing the gas and oil too lean can cause the engine
to run too hot resulting in permanent engine damage. Mixing
the gas and oil too rich will cause decreased performance and
result in a fouled spark plug. By strictly following the 25:1
ratio you can be assured maximum performance from your scooter.
Gallons of Gas Ounces
of 2 stroke oil
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The spark plug is a crucial and vulnerable
part on your two stroke engine. Your spark plug can be located
on the top of the engine under the protective rubber boot. Your
scooter comes with a tool kit containing a spark plug wrench
for easy removal.
The spark plug must be clean, and must be replaced promptly
when signs of wear begin to show. The condition of the spark
plug can tell you a lot about how your motor is running. The
spark plug should be a light brown or golden color like the
picture on the right. If the electrode is white, that can be
a sign that your scooter is running too hot. This can be a result
of either running too lean, or that the fuel and oil mixture
is too lean. If you are running your scooter to rich then your
spark plug may be black, covered with either gas, oil, or carbon.
Another common problem is that the spark plug gets clogged up
with carbon and/or oil and "fouls". This should be
checked by assuring the electrode has a clean gap of .023 in.
If you are having a problem with fouling, just be sure that
the gap, as shown to the right, is clean and free of obstruction,
A small piece of a fine grit sandpaper usually works well for
this. New spark plugs can be purchased from us on our parts
page, or at almost any local hardware or auto parts store.
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The air filter is used to clean the air going
into the engine. Periodic cleaning of this filter is recommended
to protect your gas scooter engine against the damaging effects
of dirt and abrasive particulates. Your air filter can be located
on the front of the engine and the protective cover can be removed
with one screw.
When the protective cover is removed the air filter is revealed.
You can also see the small workings of the choke and butterfly
The filter should be free from dirt and grease
and appear clean like the one shown on the right. If there are
contaminants on the filter it can be cleaned in a container
of gasoline. Allow the filter to dry before re-installing it
into your gas scooter.
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The chain on your scooter should be lubricated
before every ride. The chain should also be checked for tightness
on a regular basis. If the chain is too loose a popping sound
can be heard and the scooter will jerk under acceleration, or
the chain will just jump off altogether.. If the chain is too
tight it will be noisy and bind, this can be felt by pushing
the scooter with the motor off.
On the 22.5cc scooter there is a chain driven gear reduction
which must also be lubricated before each ride. This gear reduction
chain does is not adjustable and must be replaced when when
an unacceptable amount of slack is present.
Access for lubrication can easily be obtained
through a small lubrication hole on the top of the chain guard.
When making any adjustments to the chain it
is very important to ensure the chain and sprockets are perfectly
aligned. If they are not the chain will most certainly come
off. To properly align the chain you must get your eye level
with the chain. make sure that all components are aligned before
tightening the fasteners. Click on the thumbnails to the right
to see what the chain should and shouldn't look like.
The rear tire held on by an axle and two locking
eyebolts. To adjust the chain loosen the axle bolts and the
locking nuts. Use the eyebolt adjustment nuts to tighten and
align the rear tire. Once the chain is snug and straight tighten
the axel nuts. Finally cinch down the locking nuts on the eyebolts.
Refer to the picture on the right.
Sometimes it is difficult to get the chain
straight due to the fact that the motor and rear wheel sprocket
aren't aligned. If this occurs simply turn the scooter on it's
side, loosen the three engine mounting bolts, and the engine
can be easily slid to either side to compensate for any misalignment.
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The tires on your gas scooter are pneumatic
(air filled) tires. The tires require 85psi and can be filled
via the valve on the side of the tire. It is very important
that the tires have the proper inflation. Although the scooter
has been prepared to ride once out of the box, due to long shipping
distances and elevation changes we have yet to see one scooter
with the correct pressure right out of the box. Low tire pressure
will make the scooter feel sluggish and a loss of power will
You will notice that the valve on the 22.5cc
front tire is turned to the side a little and is not straight
out. This is intentional to keep the valve from hitting the
frame of the scooter as the wheel turns. If the valve is not
angled you will hear a clicking sound every time the tire makes
a rotation. To cure this, let all of the air out of the tire.
Hold the tire with one hand and the rim with the other. Twist
the tire one way and the rim the other. This will cause the
tire to "slip" on the rim and make the valve turn
to one side. Once this is achieved refill the tire to 85psi.
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There are two main types of scooter throttles.
One is a twist type, and the other is a hand throttle. Although
the throttles are different in operation, they are essentially
mechanically the same. When the rider applies the throttle,
a cable carries this motion down to the engine. For continued
smooth operation it is important to keep this cable clean and
free of obstructions.
Should the throttle begin to feel loose and
sloppy, the slack can be adjusted on the cable at the handlebars.
Simply loosen the lock nut and adjust the cable tension via
the adjustment screw. Once the desired tension is achieved retighten
the lock nut.
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The brake on your gas scooter is a cable actuated
drum brake. This style brake has proven well over time and is
very simple to maintain. The rear brake has two main adjustments.
The easiest of the two is the adjustment on the handbrake itself.
This adjustment has two simple steps. To change the tension
on the cable merely back off the locking nut and screw the adjustment
screw in or out accordingly. Once the desired tension is achieved
re tighten the locking nut.
Further adjustment can be made at the brake
drum itself. This task is easiest with two people. First, loosen
the adjustment at the handlebar hand brake and screw it all
the way in . Next go to the rear brake and loosen the Cable
Clamp. Once loose, pull back on the cable and have the second
person push forward on the Brake Cable Lever (push hard, you
are pushing against a tight spring action). While pushing the
lever forward and pulling the cable back, quickly tighten the
cable clamp. Additional minor adjustments can be made where
the cable meets the rear brake.
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The carburetor has many adjustments on it and
it is recommended that these adjustments be made by experienced
persons only, however we will point out the major points. The
carburetor is responsible for pumping the fuel and mixing it
with the air at a precise measurement. The carburetor does this
with very small diaphragms, orifices and ports, which are easily
clogged by contaminants. This is why is is extremely important
that you use only clean new fuel in your gas scooter.
First, the choke. There is a choke lever on the side of the
motor as pictured on the right. Some scooters have "off"
written at the top, and "on" written at the bottom.
This is incorrect and I don't know how they screwed that up..
The correct position of the choke is:
UP - CHOKE IS ON
DOWN - CHOKE IS OFF
When the scooter is brand new, been run out of gas, been sitting
for a long period or is very cold, it may be necessary to prime
the carburetor before attempting to start it. This is accomplished
with the primer pump bowl located at the bottom of the carburetor.
Simply press and release this pump several times until gas can
be seen flowing through the clear gas return line to the fuel
tank. This will help start the scooter under the aforementioned
conditions, however if this is done once the scooter has warmed
up it may induce flooding..
Due to the fact that the carburetor mixes the fuel and air at
an exact ratio, elevation, temperature, humidity and other weather
related variables can have a detrimental effect on your scooter's
performance. The manufacturer pre-adjusts your scooter at near
sea level and depending where you live your scooter may require
adjustment. The adjustment screw, or "jet", can be
located in the access hole just to the right of the choke lever.
Turning the screw clockwise will lean the mixture while turning
the screw counterclockwise will richen the mixture. It is recommended
that the jet be adjusted no more then ? turn at a time. Test
the scooter between turns and once peak performance we achieved
we recommend richening the adjustment an ? turn. This is due
to the fact that the leaner the engine is run, the hotter it
will get, and this can induce a possible seizure of the engine
If the scooter will not idle or idles too fast, an adjustment
screw is provided next to the choke. Turning this screw clockwise
will increase the idle speed. Turning the screw counterclockwise
will decrease the idle speed. Remember that an idle speed that
is too fast can be dangerous.
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The following wiring diagram was recreated
from the 'manual' that comes with the razorback gas scooters.
This diagram is intended as a reference only - it may not directly
apply to your particular model.
This wiring diagram image is copyrighted and
may not be republished without prior written consent. However,
you may print a hard copy of this image for personal use.
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