2speedboi
Well-Known Member
- Local time
- 1:32 AM
- Joined
- May 11, 2020
- Messages
- 476
The Two Speed friction drive.
I started with an idea to tackle the hills that surrounded where I live. I didn't want to sacrifice good cruising speeds for sub par torqued out low speed climbing, so I built this, with the help of a local machine shop.
The lever that brings it back to (D) drive gear, (N) nuetural, and (L) low gear, was a bike bug lever unit from which I had, but it's age and cheap metal started to show and snapped off. I have another that will work better, but I am still sad.
The 36 tooth reduction is far to low for friction, I am thinking half or less. I am using a 9 tooth output, but I'll save wieght and reduce my reduction to a 17 more or less.
It's not even close to perfect, I want something to be rugged and easy to work on, simple parts. Mostly bolts and aluminum plates. The "clutch" engagement needs improvement as well as a long lasting roller surface that provides good traction under less desirable conditions. The Diablo sand paper works pretty good but I wonder on its longevity of use to mile. The tank came from my bike bug, the engine is a fs 55 stilh which has about a little over 80 miles on it. It's roller diameter is just right at an inch, and it has pretty good mid range for keeping pace up slight inclines and has nice power build up from slow speeds. Pretty nice all around, single ring piston, could do better with a different carb I think.
I would like to try a 4 cycle engine, I just need to find one I can do I direct drive with
I started with an idea to tackle the hills that surrounded where I live. I didn't want to sacrifice good cruising speeds for sub par torqued out low speed climbing, so I built this, with the help of a local machine shop.
The lever that brings it back to (D) drive gear, (N) nuetural, and (L) low gear, was a bike bug lever unit from which I had, but it's age and cheap metal started to show and snapped off. I have another that will work better, but I am still sad.
The 36 tooth reduction is far to low for friction, I am thinking half or less. I am using a 9 tooth output, but I'll save wieght and reduce my reduction to a 17 more or less.
It's not even close to perfect, I want something to be rugged and easy to work on, simple parts. Mostly bolts and aluminum plates. The "clutch" engagement needs improvement as well as a long lasting roller surface that provides good traction under less desirable conditions. The Diablo sand paper works pretty good but I wonder on its longevity of use to mile. The tank came from my bike bug, the engine is a fs 55 stilh which has about a little over 80 miles on it. It's roller diameter is just right at an inch, and it has pretty good mid range for keeping pace up slight inclines and has nice power build up from slow speeds. Pretty nice all around, single ring piston, could do better with a different carb I think.
I would like to try a 4 cycle engine, I just need to find one I can do I direct drive with
