Building A Gas Powered Bicycle

The engine is installed on a Trek 730 chromoly bike frame. Most generic bike frames will work for the engine mounts that come with the engine. One important detail that can be seen in the second photo is the carburetor. There is hardly enough space to get the carburetor in between the engine and the bike. Because of this, l fabricated a longer intake tube that offset the carburetor to one side.

The basic exhaust pipe has been changed with an expansion chamber exhaust. The square slide carburetor has been changed with a more basic cylinder slide carburetor with a large air filter. I found that the expansion chamber exhaust didn't improve top speed by more than a few miles per hour. However, torque improved noticeably after adding an expansion chamber. It is a bit difficult to see, but there is a pulley near the sprocket driven by the engine. That pulley was made out of plastic and was later swapped out with a metal pulley before being removed completely. It was removed because it added too much resistance when pedaling and required regular oiling. 

The silver cylinder head pictured here is a high compression head used for increasing the torque of the engine. Saddlebags have been installed on the bike to add carrying capacity. The exhaust pipe had to be cut, bent and welded again to make it fit the frame properly.  Afterwards, it looked pretty bad so the exhaust pipe had to be painted. A lighting system has been installed to make night time riding possible. The lighting system is composed of a very bright headlight with 7 powerful LEDs and a tail light with two dim LEDs. I plan to make further upgrades on the bike in the future by replacing my current exhaust pipe with a better one. An upgrade I may do in the future is porting, however that risks ruining the engine, so I am still holding off on that.