Putting the motor and fitting it into a dirtbike!

Posted by: Aa11Ca in MyBlog on Aug 17, 2010

This is a crazy idea...I found when riding that the pizza cutter tires on the mountain bike were not holding out. So, I have an 0ld 80cc Yamaha dirt bike and found a cool way to retro fit the engine!

I stripped out the engine block from the Yamaha. Now it weighs pretty good. The first issue I am working on is there aren't any mounts on it. I am getting 2 pieces of solid steel tubing and going to weld them to the exact angle of the engine. Inside the motor bike frame. Its lucky I know some welders that owe me some favours. Four welds and its done the engine will sit comfortably in the frame. 25mm solid steel...gonna be a bitch to cut that.

This motor will sit and not move anywhere. Have to grind the ends down to match the angle. Thats that. The next issue is the exhaust kinda drags on the ground a bit! I have a couple methods here. First is to heat the metal and bend it nearly 90 degrees. or can cut it shorter, then re-weld the end piece. I prefer not cutting anything so will try to bend the heck out of it very carefully.

Once those minor details are done then just align the chain drive and hookup the rest of the gear. Kicks ass to cause I have a nice small sprocket at the back. Going to add a pull start but for now will have to run and start. Should be fun. I knew the mtn bike frame wouldn't hold up so this will be perfect and much more comfortable.