Urban Fatbiker
Well-Known Member
I have finished my rework and this is the build thread for "Buzzbike". My idea with this build was simplicity...yeah right. I wanted to do a friction drive and construct it so it could be moved to a different bike. I didn't like the offset engine, so I had to center it. I also wanted to use a larger diameter roller, so that meant reduction drive. Some of the other thoughts were I needed freewheeling, and ability to pull-start and roll-start. I made a mount frame out of part of a rear swingarm of a 20" suspension bike, I also used the triangle shock pivots as part of the 'toggle clutch' to lift roller off wheel.
Power is Ryobi 30cc 2-stroke. I made an exhaust for it, works fairly well, nice dirt bike sound.
Drive roller is a rubber sleeve 2 1/4" diameter (garbage disposal coupler) mounted onto PVC fittings with brass reducer end fittings screwed in, M14 x 180mm cap screw shaft. Bearings and aluminum end caps salvaged from a 750W PMA servomotor scrapped from industrial robot. Serious hi-RPM continuous duty sealed bearings. The mount is pivots screwed to the dropout rack / fender mounts, and a section of seatpost sleeve / rear triangle mounted to seatpost and welded arms screwed to the rack mount hard points.
Roller and bearing caps assembled to weld the cage.
Cage welded.
Assemblies painted. Roller and shaft assembled with bearings pressed, rubber clamped for gluing.
Power is Ryobi 30cc 2-stroke. I made an exhaust for it, works fairly well, nice dirt bike sound.
Drive roller is a rubber sleeve 2 1/4" diameter (garbage disposal coupler) mounted onto PVC fittings with brass reducer end fittings screwed in, M14 x 180mm cap screw shaft. Bearings and aluminum end caps salvaged from a 750W PMA servomotor scrapped from industrial robot. Serious hi-RPM continuous duty sealed bearings. The mount is pivots screwed to the dropout rack / fender mounts, and a section of seatpost sleeve / rear triangle mounted to seatpost and welded arms screwed to the rack mount hard points.
Roller and bearing caps assembled to weld the cage.
Cage welded.
Assemblies painted. Roller and shaft assembled with bearings pressed, rubber clamped for gluing.