Motorized Bicycle User’s Manual

General Information:

Please obey all traffic regulations.
Always wear a helmet while riding.
Remember that you are riding a motorized bicycle and other traffic may not be able to see you.
Even if they do see you, they will not expect that you will be traveling as quickly as you are, and the other traffic will cut out in front of you…guaranteed!
Never operate your motorized bicycle on a pedestrian through way, sidewalk, or bicycle path while the engine is operating.
Never operate your motorized bicycle in an unsafe or disrespectful manner.

Specification of bicycle engine kit:

  1. Type of engine: 80 feet start type
  2. Model of engine: Single cylinder air cooling 2-stroke
  3. Bore & stroke 47mm*40mm=80cc (66cc)
  4. Rated power: 2.5kw/5000r/min
  5. Max power: 3.5kw/6000r/min
  6. Ignition model: CID
  7. Compression ratio: 6/0. 1
  8. Driving ratio: 18/0. 1
  9. Fuel: No. 87
  10. Lube oil: Oil of 2 stroke gasoline engine (or oil for 10w/40 10w/30)
  11. Mixing ratio of fuel and engine oil: 20-30:1 for new bicycles/ 50:1 after running 200mi.
  12. Type of sparking plug: Z4C 14mm
  13. Volume of oil consumption: 2.5L/60mi.
  14. Net weight of main set: 7.0kg
  15. Type of clutch: Friction plate dry
  16. Cooling mode: Natural air cooling
  17. Speed limitation: 25mph
  18. Packing: 420*320*190mm

If you lose your spark, this is usually due to excessive moisture getting into the area of the coil. Water and electricity don’t mix well. It is a lot easier to hit the connections with a soldering iron to remove the wires from the coil, then remove the coil and re-attach the wires. When you are putting the new coil in place, it helps to use a piece of a business card between the magnet and the coil to keep some slight spacing in there. Don’t forget to remove it after you’ve tightened down the coil, though.

Ready to go

Fill fuel and lubricant mixture in accordance with recommendation on the manual.
Compress the cluth and start cycling bike as normal. When sufficient speed is reached, release the clutch. This will start the engine.
To stop, compress and engage the clutch lever. Brake as normal.
To stop the engine, choke the carburetor completely with the lever on the carburetor.
Alternatively, press the kill switch which is provided. When engine is not running, shut off fuel valve completely.

  1. IMPORTANT: PLEASE READ THIS: Gas and Oil Mixture for Fuel ratio
    The engine is a 2 cycle design, therefore, a gasoline/oil mixture is necessary. During the break-in person (1st gallon of fuel), the ratio for 80cc is 20 to 1. After the break-in period, the ratio is increased to 30 to 35 parts gasoline to 1 part oil.

*NOTE: Use only Synthetic 2 Stroke Oil to insure proper engine lubrication.


Remember safety

  1. Wipe up any spilled fuel. NEVER fuel a hot engine or smoke while fueling. This could result in sudden fire, or personal injury. Always move your motorized bike at least 10 feet from any fueling area before attempting to start it. Never leave the tank fuel cap off after fueling as rain water will contaminate the fuel and cause engine failure.
  2. Open the fuel valve. Small lever pointed down with fuel line in the open position.
  3. Depress the small round cap plunger (Tickle button) to prime carburetor. Located on left side of the carburetor next to the idle adjust screw. One or two times is enough.
  4. Lift choke lever to the upward position. This is the small lever on the right side of the carburetor. All the up=the choke is on. All the way down=the choke is off. Move progressively downward to off position during engine warm up period.
  5. Pill the handlebar clutch lever inward to disengage the engine from the rear wheel.
  6. Pedal (down hill if possible for first start)
  7. Let out the clutch lever all the way out and continuing to pedal. The result is a direct engine hook up with the rear wheel via chain and sprocket and the engine will now start spinning. Pedal until motor starts. Accelerate slowly at first.
  8. Twist throttle to increase speed, reverse twist throttle to decrease speed. To stop, disengage clutch and apply brakes. To accelerate, pedal and release clutch while opening throttle.
  9. Adjust choke to the smoothest engine running position.
  10. After warm up, push choke lever all the way down. If engine races too fast or twoo slow, pull clutch level and lock in the notched catch, stop and adjust engine rpm.
  11. If the rpm needs adjusting, turn the idle adjust screw (left side of carburetor) in or out slowly to obtain the proper idle speed of about 1400 rpm +/- 100 rpm to correctly break the engine in. Do not excpeed 15 mph or 30 minutes of continual running for the first 50 miles during engine break in. Engine will develop more power after break in.
  12. To stop the engine, push Kill switch and turn off gas valve at tank. Turning off the gas will prevent fuel from being siphoned from the tank. Warning Note: Never leave the tank gas valve in “open position” when engine is not running or the bike is in storage.
  13. After or before each ride, check all mounting fasteners, including hd. bolts, axle and brakes.
  14. Warning Note: Engine lock up or piston seizure due to improper gas / oil mixture will not be covered by factory warranty. This is the responsibility of the owner / operator to make sure the gas and oil is mixed correctly.

Frequently Asked Questions

Do I need a driver’s license to ride a motorized bike?
In most states you don’t need a driver’s license to ride the motorized bicycle, but the laws are different in some states. We recommend that you check in with your state laws.

Maintenance Routine


  1. Remove right side cover from engine.
  2. Place a small dab of grease at ear mesh area.
  3. Replace cover.


Depending on dusty riding conditions, clean air filter every 5 to 20 hours of operation by removing the filter cover to access the screen and element. Wash element with a degreasing agent. Be sure element is completely dry before re-assembly.

Spark Plug

Remove spark plug and inspect for excess carbon build up. Clean, re-gap to .6mm – .7mm if necessary. Check plug after every 20 hours of operation. A suitable replacement plug is NGK BP-6L if you can find it. Otherwise, go for the NGK B-6L. The NGK R7-HS is also recommended for better performance and smoother idling.

Exhaust system

After 20 hours of operation, check exhaust pipe for excessive oil and carbon build-up.

  1. Remove exhaust pope cap by loosening the retaining screw.
  2. Pull cap and baffle out of pipe.
  3. Clean with degreaser, rinse and dry.
  4. Reassemble.


Excessive periods of low speed operation, idling or leaving fuel petcock in the “on” position during shut down periods may cause the pipe to become clogged with unburned fuel.


every time bike is ridden, check the tension of the drive chain by:

  1. rolling bicycle forward to remove slack from the bottom of the chain.
  2. Find center and push downward on the top of chain while measuring the deflection.
  3. Tighten chain if deflection is more than 15mm.
  4. Low speed “chain rattle” can be eliminated with the application of graphite grease to chain.

Head Bolts

Tighten all fasteners after each five hours of operation. It’s most important to check cylinder head bolts: tighten in an X pattern to 12ft./lb. using a toque wrench. A two piece cylinder and head design engine requires head bolts be kept tight.


Check head bolts before each and every ride. Vibration can cause them to loosen and blow a head gasket. Caution: Do not over torque or head bolts may break off.

Right side gears

Remove cover plate and keep small amount of heavy grease on gear train (lithium). Do not over grease as leaks will occur and also may adversely affect clutch operation. Regular greasing if required will help reduce gear wear and keep gear train quiet.

General Information