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What type of gas should I use?back to top
For best performance, use high octane gas from a local gas station. 91 - 93 octane premium unleaded fuel is recommended. You may also use 87 octane gas as well. Do not use any type of diesel fuel.

What should the oil mixture be?  How do I mix it?back to top
(This section only applies to our 2-Stroke bikes; 4-Stroke bikes need only pure gasoline)

The gas-to-oil mixture should be 50:1. Mixing the fuel is very easy and takes less than 1 minute. Using the provided mixing bottle, pour the gas into the bottle to the specified line (up to the "576" line) and pour 2-Stroke / 2-Cycle Small Engine Oil ( This type of oil is available at any auto parts store. Do not use regular car oil ) to the designated line (up to the "600" line). Close the cap and shake for 3 seconds. You are ready to fill the bike's gas tank with the mixture.

To sum this up, add Gasoline 1st and fill it to the "576" line. Then add a little bit of 2-stroke oil. The oil will only top off the bottle from the "576" mark to the "600" mark.

fuel mixing

How do I properly start the bike with the Pull Starter?back to top
Below is the proper procedure to start your pocket bike via the Pull Start:
1. Stand the bike upright; you should be straddling the bike. The pull start cord is on your right side.
2. Make sure the fuel petcock valve is in the vertical position ( the white valve lever should be straight up and down ).
3. Put the choke lever in the closed position ( the metal lever in the UP position ).*

bike carburetor starting

4. Pull the start cord out slowly until it reaches its maximum length and then let it retract. Repeat this procedure 2 times.**
5. On the 3rd attempt, pull the cord out swiftly with one strong pull.***
    ( pull the cord straight back; do not pull at an angle, as pulling it at an angle may damage the cord ).
6. Repeat steps 4 and 5 until the bike starts.****
7. After the bike starts, let it warm up for 1 minute. Then put the choke lever to the open position ( metal lever down ).

bike carburetor riding

8. The bike is now ready to ride.

* In certain weather conditions, you may put the choke lever in the middle position to help make it easier to start.
** Starting may require several tries when the bike is still new. After break-in, the bike will start up with only one or two pull procedures.
*** It may help to give the bike a little twist of the throttle on the 3rd quick pull if the bike is hard to start.
**** In colder climates, pre-heating the motor with a hair dryer makes it much easier to start the engine.

How do I check and adjust the chain tension?back to top
For all pocket bikes and mini dirt bikes, proper chain tension is CRUCIAL. This is especially true for bikes with a suspension system such as the GP RS-R, RX1 Traxxis and the KTX Radical Mini Dirt Bike.

Before operating:

1. Have the rider sit on the bike with his or her full weight on the vehicle.
2. With your thumb and index finger, grab the chain at its midway point between the two gear sprockets.
3. The chain must have play / wiggle room of 1/2 inch to 3/4 inch.

If the chain moves more or less than the above parameters ( 0.5 - 0.75 inches ), you will need to adjust the chain tension prior to riding. Failure to do so may result in the chain breaking or falling off.

How to adjust Chain Tension:

1. Locate the two large axle nuts on either side the rear wheel axle.
2. With two wrenches or socket drives, loosen the axle nuts approximately two to three full turns.
pocket bike axle nuts
3. Locate the two smaller nuts on the eyelets (silver color) that are connected to the axle towards the rear of the frame.
bike eyelet nuts
4. Either loosen or tighten the eyelet guides to achieve desired chain tension ( 0.5 - 0.75 inches of play )
     ( Turn small eyelet nuts counter-clockwise to loosen chain.  Clockwise to tighten chain )
     ( Rotate the same amount on both eyelet nuts. e.g. If you turn the left side 3 turns, turn the right side the same turns )
5. Now move the rear wheel in the direction you need to by either pulling the wheel rearwards or pushing it forward.
     ( Move rear wheel forward to loosen chain tension; Move rear wheel rearwards to tighten chain tension )
6. Check for proper chain tension before tightening up the Large axle nuts.
7. After desired chain tension has been achieved, tighten both Large axle nuts in the opposite way of STEP 2.
     ( The smaller eyelet nuts do NOT need to be re-tightened. They only works as guides. The nuts are designed not to come loose )
8. Your bike is now ready to ride!

Engine will not stay on.  How do I adjust the idle?
Bike wants to take off when idling.  How do I adjust the idle? back to top
On the left side of the carburetor ( "left side" is rider perspective, if you are sitting on the bike ), there is a small Gold-Colored FLAT HEAD screw. It may be hidden under some wax sealant. If so, scrape off the wax to reveal the gold flat-head screw. This is the idle adjustment screw.

With a small flat head screwdriver, rotate the screw counter-clockwise to decrease the idle and clockwise to increase the idle. Rotate no more than 1 full turn at a time to adjust properly.

* Remember, this is a Small Flat Head screw. It is angled about 45 degrees facing the ground within the body of the carburetor. Do not loosen any Phillips head screws. Only adjust the flat head screw.

carburetor wax seal     carburetor idle screw

How do I adjust the Speed Governor on my Pocket Bike?back to top
There are two ways to limit the top speed of our 2-stroke engines. This limiter is used for beginner riders or for those who are not yet comfortable going maximum speeds.

The first way is to move the choke lever on the carburetor to a position that is anywhere between fully opened and fully closed. The choke lever can be accessed via hand without the use of any tools on the right side of the vehicle. Normally, for full-on unregulated top speed, the choke lever is fully opened (in the down position). However, this lever can easily be moved up anywhere you feel comfortable. The engine will then be receiving less air, and the vehicle will consequently run at the pace you set it at. To compensate for less air, you may turn the petcock fuel valve ( the white valve lever ) at about a 45 degree angle to allow a slower flow of gas to match the lower air intake volume so your motor will not run rich ( if you see excessive white smoke from the exhaust pipe ).

The second way will be to adjust the actual throttle travel. The concept is similar to limiting the gas pedal travel on an automobile. The less "gas" you are able to give the car, the lower its top speed. To do this, you can adjust the throttle cable slack via the tensioner on the throttle grip box. Simply slip off the rubber dust boot / sleeve and loosen the tension ring by hand (no tools necessary) and turn clockwise until you get your desired speed. Then tighten the tension ring and you are ready to go.

* Depending on the type of carburetor installed on your vehicle, there may be another similar adjustment knob on the carburetor, also covered by a rubber boot. You can locate this knob by tracing where the throttle cable enters into the carburetor.

How do I fill air in the tires?  What is the correct PSI?back to top
The tires have valves similar to automobile tires. Any air filling device designed for automotive tires will work for these tires as well. The correct pressure is 30 PSI in front and 32 PSI in the rear tires. ( For riders above 170lbs, fill 37 PSI front & 40 PSI rear ).

How long is the break-in period?back to top
When the bike is new, it is recommended that it not be run at max RPM's for more than 1 minute at a time during the initial break-in period, which is about 3-4 tanks of gas. After that, you may run the bike as hard as you want.

How long can these bikes be ridden continuously?back to top
We recommend that you give these bikes a cool down period of 10 minutes between each tank of gas, depending on the weather. However, our test riders ride these bikes continuously for over three hours on a regular basis without any problems.

How long is the riding time per tank of gas?back to top
This really depends on the riding conditions. One tank of gas typically lasts 1 - 1.5 hours in moderate riding conditions.

I broke a part on my bike.  How can I fix it?back to top
How to go about repairing your bike depends on which part is broken. The majority of parts on these bikes can be repaired and replaced by a regular do-it-yourself person. No special tools are needed. If a part happens to break or needs replacing from wear and tear (such as brake pads and tires), please check the OEM PARTS section on our web site, email us directly at Customer Support or call us Toll-Free at 1-877-MPR-BIKES (1-877-677-2453). We offer replacement parts at 20 - 30% discounts if you purchased your bike from us.

How do I fix the exhaust if it is damaged?back to top
The exhaust can become damaged after a hard crash. Though the bike can be ridden without its muffler / silencer, it can become quite noisy. Most damage sustained in the exhaust piping can be welded at your local muffler shop. Prices for simple welds run anywhere from $5 to $10 depending on the shop. However, if you do manage to damage your exhaust pipe, it would be a great opportunity to upgrade to one of our Performance Exhaust Systems on our PERFORMANCE PARTS page. Not only is it more durable than the stock pipe, it will increase the performance of your pocket bike along with giving it a sporty new tone.

Is the Fuel Filter necessary?  How do I replace it?back to top
Most of our bikes include an inline fuel filter installed on the rubber hose that leads from the fuel tank to the motor. It is there to add an extra layer of protection for the motor in case debris is introduced into the bike's fuel tank. If you are careful in keeping contaminants out of your fuel tank, you may bypass the fuel filter by purchasing a similar rubber hose at your local auto parts store and cutting it to the length needed to reach the fuel tank and the motor and discarding the old unit.

If you would prefer to use the fuel filter and need to replace it, you may purchase one on our OEM PARTS page.

Gas is leaking from the overflow tube.  How do I stop it?back to top
This is a common adjustment and it is due to the carburetor float getting stuck. This can happen if the bike is laid on its side or the vehicle sustained an impact. The tube is doing what it was designed to do in this type of situation ( see picture below of overflow tube ). To loosen the float inside the carburetor, follow these simple steps:

1. With the bike standing upright, lift the rear portion of the bike 18" to 24" off the ground.
2. Drop the rear of the bike from that level onto its rear tire. Do this forcefully, as it will not damage the bike.
3. Repeat this procedure until the float comes unstuck. You will know when gas stops flowing out of the overflow tube.

* You are essentially bouncing the rear of the bike forcefully, several times, to dislodge the float inside the carburetor.

bike carburetor overflow tube

Remember, you are always welcome to call us Toll-Free (1-877-677-2453) for assistance to these or any other questions.

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