I'm new to this concept, mind helping me out? :)

[lavie2k9]

Here's my scenario:

I have an old Briggs & Stratton horizontal shaft motor that I got off of my old go-kart that got wrecked. It has 5 horsepower printed on the side of it and it has a centrifugal clutch with a gear attached to it. I am not sure how many spokes are on it because I'm not at home right now.

How does this motor compare to those others that are popular?
60/80cc Chinese motors, Whizzers, etc.

Could I just weld a mount into the bike and mount it under my thighs like a regular motorcycle and run the chain and be done with it?

I want to keep the rear gear casette. Is that a bad idea?
I don't know if that motor will rip it apart...

[Bikeguy Joe]

Welcome to the forum.....what you want to do can and has been done, but that's a lot of hp for a bike frame.

Check out our DIY forum for a lot of tips!

[dmar836]

The rear wheel could be a dangerous weak point IMO. Under no circumstance(well, maybe at gunpoint) would I mount such a high torque motor to a bicycle with a spoke mounted rear sprocket. Figure a better hub mounted version and it's doable. Very wide, but doable.
I used a Worksman drum rear and spun the threads off the hub with the steel freewheel in less than 2 miles of testing.
Dave
KC