Knight Racer 8G

Limited edition kit features a 49cc HuaSheng motor with Clutch Flyweight for 5/8 Tapered Shaft. Using a belt drive single speed transmission for smooth acceleration. This kit includes a 2 piece wide crank kit, if the bike has a 1 piece crankset a conversion bottom bracket will need to be used (not included).

NOTE: If you have a bicycle with a one-piece crank, you will need to buy a bottom bracket conversion kit separately. Please select the option above.

4 Stroke engine kits are very different from 2 stroke kits in many ways. Building a 4 stroke bike is a little more involved then the two strokes, the extra effort is worth it. Pull start engine, not push start like the 2 strokes. Overall this type of engine is more reliable with more power and torque. With some of the larger cc motors, the top speeds far exceed the 2 strokes. Since these motors are larger in cc they are also larger in size and weight. Almost all bicycles will need to use a wider crank setup to clear the motor, the stock arms and pedals will hit the motor when pedaled as a regular bike. One piece cranks will also require a bottom bracket conversion set as well (not included).

This style of the engine might need slight modification to the bikes and will not fit all frames.

Advantages of 4 Stroke Bicycle engine kits:

• Use straight gas (no mixing oil with gas)
• More Horsepower
• More Torque
• Quieter Engine

This 4-Stroke Kit includes:

• HuaSheng 49cc with Centrifugal Clutch Engine (4-Stroke)
• 100T Freewheel Belt Transmission for Tapered Shaft
• Chrome Muffler
• 2.5 L Gas Tank
• Gasoline Tank Switch (AL)
• Fuel Line #2
• Fuel Filter
• Improved Wide Pedal Crank
• 44 Tooth Sprocket
• Pineapple Bushing
• Accelerograph Throttle Handle
• Throttle Cable 50"
• Mounting Plate
• 415 Heavy Duty Chain
• Idler Pulley Chain Tensioner
• Chain Guard

• No load RPM: 8500 Cooling: Forced Air
• Displacement bore & stroke: 41.8 x 35.8
• Power: 1.2KW @6800 rpm
• Torque: 2.0Nm @4500 rpm
• Engine net weight: 5.2 kg
• Length x width x height: 247 mm x 225 mm x 335 mm
• PTO shaft rotation: CCW centrifugal clutch
• Crankcase oil change: 50 hours after the change, first at 10 hours operation
• Rear mount engine has closed loop fuel system. V-Frame mount does not

* Orders received Monday - Friday by 3:00 PM EST are eligible for
Same Day Shipping! Except for USPS which ships the next business day.

Our gasoline operated products are NOT compliant with Environmental Protection Agency ( E.P.A. ) or California Air Resources Board (C.A.R.B) for the use on/off Public roads. Upon purchase, the buyer agrees to use products for racing (closed-course competition) only and NOT for on/off public roads.

If you need help with installation or troubleshooting, kindly use our Builder Locator to find builders near you. Builders are experts with motorized bicycles.

Knight Racer 8G Manual