On my 99 Zuma (I know its not a moped casey) I've done a bunch of mods. I put on a higher compression engine, larger carb, better airbox, carbon fiber exhaust...ect
I found that my belt was slipping a lot until I got going about 25mph. Then the bike took off.
Recently I bought a stiffer clutch sping, and put it on. It made a big difference. The bike now does wheelies!
Would an even stronger spring give me better low end?
Can you put in too strong a clutch spring? Would it harm the bike or have other bad effects? Malossi makes 2 stiffer springs...would the stiffest have any bad effects?
Also there is a dead spot between 12mph and 24mph. It sounds like the engine slows down in this zone. Does this sound like I should lean out my needle setting?
I know this is a scooter question, but no one in the scooter forums could answer it.
Also FYI the Zuma has a pulley transmission system with a front pulley (variator) and a rear pulley (clutch).