Tim Krantz
Guest
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Don't know if this will help or not, but I was having a wail of a tme keeping A RD400 Yamaha's clutch from slippng after doing some engine mods. I miked the steel and fibre plates,and all was well within specs, did the shims,as suggested on another site, but the slippage continued. This was during heavy acceleration at drag strips. Finally I took a tip on another site and swapped 3 of the 6 pressure springs out of a factory roadracing model, and the problem was cured, with just a little more effort at the clutch handle. It seems to me(and I've been wrong about things,more than right) that shimming doesn't put more pressure on the plates, unless the springs are progressive rate springs, hence the shimming didn't work?????? Anyhow, maybe alternative springs may be the answer????
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