I always replace the clutch springs on these with some aftermarket, slightly more heavy duty type. They all seem to need it. I'd start with just that before replacing the whole clutch. Springs are cheap ($10 to $20). If you're ordering parts from 650Central, talk to him about them. He offers 3 "flavors", mild, medium, and really stiff. Explain your issues and your mods, and he'll recommend which springs should suit you.