Any motor bike buldiers here?

[Waldamir]

I'm looking to put together a motor just to get around town but I know nothing about how to build them. I was wondering if anyone knows anything about these and could give me some good resources or information on putting these together

Thanks guys.

 

[Sid Post]

Are you referring to adding a small gas engine to a bicycle?

 

[Waldamir]

Are you referring to adding a small gas engine to a bicycle?

Yes I am

 

[Liam021]

Me and my freinds use to do this as kids in the trailer park. We would take an old chainsaw and weld a bike sprocket on to the chainsaw. Then we would weld the saw to the middle of the frame of the bike, and run a chain from the saw to the forward biggest sprocket on the outside. If you can get a bike 21 speed or so you can do it and even scavenge an old muffler and attach it to the saw for noise. I remember we use to make them out of old fire extinguishers. We would then take the front brake and attach it to the throttle on the saw and so when you pull the brake arm it pulls the throttle on the saw. Just tape down the throttle safety. If you can still get the back gears a derailers to work you can get going pretty fast on it. Another benifit is you can still pedal to get started then just shift down and get the saw to take over. I remember with the right gearing we could get going 25-30 kmph easy.

The bikes looked similar to this. They are long gone now but I would like to build another sometime.

 

[theHobbyist]

Ask the goog about piston bikes... that should get you what you're looking for
FWIW: A chainsaw motor + 10 speed = stupid amounts of fun with a dash of road rash lol

 

[De Plano]

If you want a resource http://motorbicycling.com/

I wanted a board track repro for a while

 

[beau5278]

There are a lot of guys building them at ratrod bikes, it's a forum like this one with some interesting build threads. Some are using small B&S 4stroke engines but I've seen small Japanese or Chinese built 2 strokes sold as a kit that bolts right onto your frame.

 

[mwerner]

I really wanted to build one.... I happened to have a 100cc snow-blower engine on hand that I thought would work. The site mentioned above has literally anything you might want.... An active forum, plenty of ads for suppliers...

According to most, the Chinese-made 2-stroke kits vary wildly in quality. Apparently if you get a good one, it's fine. If not....
Honda makes a typically-Honda 4-cycle engine that mounts on the back and drives the wheel with a friction roller... Likely very reliable.
My snow-blower engine didn't work out... The exhaust port was a huge square opening that had a simple metal box for a "muffler"... No way this would ever pass on the street and no way of attaching a real exhaust system short of machining a plate to cover the hole.... Beyond my skills.