Ive been fooling with my Moby over the last few weeks. Got the slow cylinder ported and decked, it's peak power is right around 9k now. I had it hit lower when my pipe was longer, but i shortened it cuz my goal is to make this into a 50mph ripper on the ported slow 20mph jug. Port map to come soon. Made a launch lever, never had one before. The manual shifting is really fun!
So the only issue I've had is the stock clutch. I modded it by cutting the arms back, and when the pipe hit lower, it slipped great and climbed steep hills from a dead stop aimed uphill.
Now that my power comes on about 1.5k higher, it doesn't slip enough only while starting from a stop on a hill. It performs fine on flats. So I have to pedal up hill til I get to about 5mph to get it to 3k or so then it climbs the hill super fast for a 50cc as long as I hammer the launch lever.
I have an er3 on the way, but I had an idea last night about the stock clutch.
What if the solution to the stock Moby clutch engagement was not modding the clutch itself? Seems to me that if I pulled the engine back a bit at takeoff (by cable or pulling up on the launch lever) and let the belt slip a bit, that would spool it up and off you'd go. Yes, the belt would get eaten up over time, but no more than the er3 eats em. And the A series belt I'm using is cheap cheap cheap.
I'll try it first just by pulling up on the launch lever. Any Moby people do this? I just never thought about pulling the motor backwards to act like a slipper clutch....