Some of you might remember this from my help thread but thought I would show off my bike and a little info about it. This engine came off a 36cc craftsman chainsaw which is the same as the 36cc poulan. This bike has been extremely reliable. I have driven almost an entire gallon of gas through it so far which seems to be about 80 miles total (80-100mpg). Most of it has been at wide open throttle. According to the GPS it has topped out at 34mph and I was using a 7/8 drive socket which is 1.25 diameter.
Hardest part was probobaly the custom mount. Since the plastic case holds the magneto, I had to carefully mark it's position to the flywheel and build it into the motormount. Also I had to insulate it with electrical tape and fiber washers since grounding it kills the igntion. Since the case bolts holds the crankcase and cylinder together, the whole engine came apart when I took it out of the plastic case.
Gas tank was a gatorade bottle which did not hold up well. The new tank is 1 liter fiji water bottle which has worked great! Hmm what else.. I had a gravity/scisor clutch but took it off due to cable strech. Seems to run just fine as direct drive though. Petal to start, and it stalls the engine when you stop. Works awesome! I do have a brace to raise the motor in case of a breakdown that I strap with a wrench to the bike frame. Throttle is connected to the pedal gear selector. Who needs more than 5 gears anyways!! Built the hinge and mount out of 1/8x1 angle steel which is bolted to the frame on the bike side. I can shim it out with washers to help align the drive roller on the wheel where I want it.
I could not find an M8 1.0 reverse thread nut to fit the driveshaft anywhere in town or on the internet so what I did was disassemble the clutch and cut the center out of it. I was going to weld a nut to it however I left it in an oval shape so I could tighten it with channelock pliers. Works great! The socket is a 3/8 drive drilled out slightly bigger to fit over the shaft. A washer sits on the driveshaft shoulder and keeps the socket from sliding onto the cyclinder. Spring came from a trampoline. Only problem I keep having is the case seal keeps leaking.. Had it apart about 4 or 5 times now with permatex motoseal and #3 formagasket. I'm about to just use some black rtv and see how long it holds up.
Anyhow here are the pictures! Hope this gives some ideas for your build.
Hardest part was probobaly the custom mount. Since the plastic case holds the magneto, I had to carefully mark it's position to the flywheel and build it into the motormount. Also I had to insulate it with electrical tape and fiber washers since grounding it kills the igntion. Since the case bolts holds the crankcase and cylinder together, the whole engine came apart when I took it out of the plastic case.
Gas tank was a gatorade bottle which did not hold up well. The new tank is 1 liter fiji water bottle which has worked great! Hmm what else.. I had a gravity/scisor clutch but took it off due to cable strech. Seems to run just fine as direct drive though. Petal to start, and it stalls the engine when you stop. Works awesome! I do have a brace to raise the motor in case of a breakdown that I strap with a wrench to the bike frame. Throttle is connected to the pedal gear selector. Who needs more than 5 gears anyways!! Built the hinge and mount out of 1/8x1 angle steel which is bolted to the frame on the bike side. I can shim it out with washers to help align the drive roller on the wheel where I want it.
I could not find an M8 1.0 reverse thread nut to fit the driveshaft anywhere in town or on the internet so what I did was disassemble the clutch and cut the center out of it. I was going to weld a nut to it however I left it in an oval shape so I could tighten it with channelock pliers. Works great! The socket is a 3/8 drive drilled out slightly bigger to fit over the shaft. A washer sits on the driveshaft shoulder and keeps the socket from sliding onto the cyclinder. Spring came from a trampoline. Only problem I keep having is the case seal keeps leaking.. Had it apart about 4 or 5 times now with permatex motoseal and #3 formagasket. I'm about to just use some black rtv and see how long it holds up.
Anyhow here are the pictures! Hope this gives some ideas for your build.
