Originally Posted by worksuxxx
Ok, I have toasted two sets of crank bearings in under 12 hours. I can't seem to get the crank tight enough without allowing for any play.
The non-cartridge BB for 4-strokes is a royal pain to make go right, it is just a poor system design.
What seems to work is:
1. Make sure you have good solid bearing cups in the BB up flush against the frame before you even start.
2. Put the bearing holder part of the enclosed bearings to the inside in the cup.
3. Screw the right pedal side crank arm retaining nut in first all the way AND DON'T LET IT OR THE SHAFT MOVE AGAIN.
4. Put on the big left side ring up pretty snug but not tight enough to grip the crank shaft and then the really tricky part, you need to keep that but in place while you screw the retain nut up against with some good torque against each other to keep them from moving WITHOUT LETTING ANYTHING ELSE MOVE.
You could just replace those bearing cups with cartridge cups for $12.
Then put in a cartridge BB crank shaft wide enough for a 4-stroke for $15.
Notch the shaft where you want your pedal sprocket to go and use the kits crank arms and be done with it.