Proper scooter maintenance is crucial to
getting the most out of your scooter. The following
instructions are for our Gas Powered City Rider and
Razorback scooters sold at neoscooters.com,
however most of the principals are universal and can be
utilized on all makes of gas scooters.
You should also consult your owners manual as certain
things such as fuel mixture or tire pressure may vary from
scooter to scooter. If the information presented here
contradicts your owner manual, then you should trust the
manufacture and abide by their specs.
Information on this page is provided on an AS-IS basis
for educational purposes only. Neo Scooters claims no
liability or warranty for any damage or injury caused
directly or indirectly from the information provided on this
If you have any questions regarding the maintenance of
your scooter, or have any suggestions that may help other
scooter owners please contact us via email.
Furthermore we remind scooter enthusiasts that although
our gas scooters are toys, they can be dangerous if not
respected. Please follow safe riding practices and ALWAYS
wear protective gear.
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/a>. By strictly following the 25:1 ratio you can
be assured maximum performance from your scooter.
Gallons of Gas
Ounces of 2
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
The spark plug must be clean, and must be replaced promptly
when signs of wear begin to show. Thecondition
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 (See
or that the fuel and oil mixture is too lean (See theFuel
and Oil mixturesection).
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 ourpartspage,
or at almost any local hardware or auto parts store.
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. (Gold screw shown to the right.)
the protective cover is removed the air filter is revealed.
You can also see the small workings of the choke and
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
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.
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.
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
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.
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.
The tires on your gas scooter are pneumatic (air
filled) tires. The tires require the
tire pressure indicated on the side of the tire 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 be felt.
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 the
pressure stated on the side of the tire.
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.
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
Gas Scooter Brakes
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
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.
Gas Scooter Carburator
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.
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
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
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 from overheating.
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.
Typical Wiring Diagram for an
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