Zr 900 Clutching Question ?

jgf_zr · Mar 2, 2003

I purchased a used ZR 900. The previous owner installed a clutch kit. From the markings the kit appears to be a Speedwerx kit but I'm not positive. The helix is stamped 61/55X, the weights are stamped with an "R" and the primary spring is a pewter color with a light blue dot. The secondary spring is a pewter color as well but I don't see any other color on it.

Does anyone have experience with one of these kits, does it appear to a Speedwerx ? If so my question is the engine is over-reving to about 7700rpm. The sled is stock except for the clutch kit. Is this the right kit for a stock ZR 900 ? What can I do to get the rpm back around 7300rpm? My buddies stock clutched ZR 900 had better acceleration and more top end on the lake and he outweighs me by 30-40lbs.

phazerhater · Mar 2, 2003

Didn't the guy you bought the sled from tell you what clutching he installed? If nothing else just give him a call as that would be the easiest way to find out what is in there for sure.
You are definitly over reving though and should be around 7300-7400 rpm. ???

jgf_zr · Mar 3, 2003

The previous owner was no help. I believe it was installed by the dealer where it was originally bought. Maybe I'll give them a call. The markings and colors really do point to Speedwerx. I call them tomorrow, maybe this kit was meant to go with their pipe.

jgf_zr · Mar 3, 2003

Just an update:

I talked to Speedwerx and it is a Speedwerx kit. It is the correct kit for stock pipe ZR 900. He said it should rev 7400-7500 and that 7700 is too high. He said it seems like a problem with the driven clutch, either the spring setting is too high or he has seen the bushing go bad and causing a binding.

Zr 900 Clutching Question ?

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