How tight should I tighten the sprocket bolts?

SeattleMike · #1 03-19-2008, 09:48 PM

I'm installing my 80cc on my mountain bike now. How tight should I tighten the sprocket bolts? I have a gut feeling that I should go tighter than it is said on these instructions:
Instruction Manual - Gas Powered Bicycle Engines, Motorized Fast Bicycles, Motor Gas Engine Bicycle, Bike Conversion Engine Kits, Motor Assisted Bike Engines 80cc and 49cc, Peddle Start Motorized Bicycle Engine and more!

What do you guys think?
~Thanks

**Ilikeabikea** · #2 03-19-2008, 10:02 PM

I used 1/4" drive ratchet and tightened about as tight as I could with one hand. I didn't get brutal or anything just good normal tight. I started out with them just snug and went round and round tightening them trying to keep sprocket straight. Hope this helps.......................

SeattleMike · #3 03-19-2008, 10:54 PM

I should have read the instructions that came with my kit instead of looking at those picture instructions from zippycycles.com ! The photo of the sprocket shows both rubber washers on the inside of the spokes, rather than one on the inside and one on the outside like my instructions say. I have a feeling my instructions are right, what did you guys do?

**paul** · #4 03-19-2008, 11:00 PM

yes one on inside and one on outside. here is a pictorial on installing the sprocket http://motorbicycling.com/f30/motori...ocket-381.html the pictorial is about changing out site of you sprocket but great for initial installation also

SeattleMike · #5 03-19-2008, 11:20 PM

This forum is so great, you guys are really helpful and nice! Thanks

bgoates · #6 03-19-2008, 11:28 PM

The instructions I saw recommended a rubber washer on inside and outside only for bikes with coaster breaks. I'm not sure why that would make a difference.

**Norman** · #7 03-20-2008, 09:02 PM

Follow our instructions and you will be successful if you don't understand anything don't be afraid to ask. I use the fiber gasket on both sides to get a good grip on the spokes, keeps the sprocket off the spokes, provides space to aline the front and rear sprockets.
Norman

**Bikeguy Joe** · #8 03-21-2008, 07:47 AM

One on the inside, one on the outside, it's the only way it will work and keep working.

**Norman** · #9 03-24-2008, 08:38 PM

Listen to Joe.
Norman

deacon · #10 03-24-2008, 09:12 PM

I agree its the only way that makes sense. Metal and metal will never grip like that wrap around fiber.

I tightened mine till I felt like the nut stopped moving, not till the puller handle bent. But you should check it now and then, as it will probably get loose after a while. Everything gets loose after a while