Here is a nice motorized bicycle performance motor, completely gone through by Fred!

This one has a 40 mm stroke, stuffed crankshaft.

The front mount is a wide 1 - 9/16".

If your bottom frame tube is smaller, you can JB Weld a piece of sheet metal of the appropriate thickness in place between the engine and frame.

Here are the important features of this engine:

• 40 mm stroke, stuffed crankshaft
• 6.0 cc combustion chamber, center fire Fred Head
• Modified type A piston
• Stage 2 modified cylinder body with advanced timing
• CR Machine intake plenum with 19 mm spigot
• 15 mm SHA style carburetor fitted with .70 mm jet
• air filter
• .60, .65, .75, .80 mm additional jets
• Throttle cable
• NGK B8HS spark plug
• 1- 9/16" width front mount

First, this motor is fitted with a Fred head that has a 6.0 cc combustion chamber volume which will allow you to run normal pump fuel (91-94) using any of the common exhaust system available for these engines.

The better the exhaust, the more power the engine will produce.

The cylinder body is a modified stage 2 version and is fitted with my unique intake plenum with a 19mm spigot.

This engine comes with a 15mm Dellorto SHA clone carburetor, factory fitted with a .70mm jet and low profile air cleaner.

VERY IMPORTANT:

This engine is fitted with a balanced race crank. This crank has been tested and approved for high engine speeds.

I have tested a similar engine on my 26 inch test bike with a 30 tooth rear sprocket, and reaching high speeds is no problem.

In fact, I must reiterate that with this engine, you will be able to reach high speeds. This is my entry level race engine. More advanced engines will be available in the future, but are in the process of development.

 Please, for your own safety, wear protective gear and a real helmet, otherwise, you will be taking a big risk with your life!

Please read this important disclaimer:

I will provide the best technical support I can give, however there are no warranties for this engine.

This engine is designed for non road use,  and operating a motorized bicycle is inherently dangerous.

Because of this, the buyer is responsible for any damages or losses that may occur to themselves, others or property from the use of this engine.

Fred Chelminski or CR Machine will not and cannot be held liable for any kind of direct or indirect damage or loss that the use of this or other products may cause.