Razorback Gas Scooter Maintenance 

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.

1 gallon of gas : 5 ounces of 2 stroke oil
2 gallon of gas : 10.25 ounces of 2 stroke oil
3 gallon of gas : 15.5 ounces of 2 stroke oil
4 gallon of gas : 20.5 ounces of 2 stroke oil
5 gallon of gas : 25.5 ounces of 2 stroke oil

Spark Plug

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 left. 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 the Carburetor section), or that the fuel and oil mixture is too lean (See the Fuel and Oil mixture section). If you are running your scooter too 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.

Air Filter

When the protective cover is removed the air filter is revealed. You can also see the small workings of the choke and butterfly valve.

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.

Chain

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.

WRONG WRONG RIGHT
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. Refer to the pictures above 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.

Tires

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.

Throttle
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.

Brakes

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.

Carburetor

CHOKE

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. The correct position of the choke is:
UP - CHOKE IS ON
DOWN - CHOKE IS OFF

PRIMER

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.

JET

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 ¨û turn at a time. Test the scooter between turns and once peak performance we achieved we recommend richening the adjustment an ¨û 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.

IDLE