GPZ550/615 frame off restoration clutch slipping after power up

Sir's ET: All

I rebuilt the engine with the 615 kit, put a 4 into 1 Kerker on and ported/polished the head, it seems to be making some decent power now and the clutch is slipping right at about 6000rpm as the power comes on.  Anybody run into this before?   Does anybody make racing clutch plates or heavy duty for the GPZ/KZ550 form factor?  

Thanks
577Nitro-

How old are the clutch springs?

EBC sell replacements that are 10% stronger than stock and much cheaper. You can also run shim washers on them to gain a little more stiffness if its needed. They do back off over time.

OEM Kawi fiber plates are the best, but if you need aftermarket look to Barnett.



Barnett is made in the USA so you can order parts just about anywhere.

I run a 831cc KZ650 putting out around 90HP to the wheel with stock clutch/EBC springs and zero slippage.

I'd get new OEM springs, not aftermarket, unless you got a Kung Fu grip.  Lube the clutch cable and release mechanism while you are at it.

Listen to Ness. Plus get the good new motion pro cable.