Cat 990 motor running 800 cat crank

[angelljb]

I have a 2002 cat 800 that was built up to a 990. I have put it in a polaris edge chassis and wanted to know if I can run a polaris 800 clutch on it. The bore seems to be the same but I want to know if anyone has tried this and how the result was. Thanks

 

[Idcatman3]

The cat crank has a 33mm taper, I believe the polaris 800 had a 30mm taper. To run a P85 clutch, you need to have it bored out 33mm.

 

[FTXMOTORSPORTS]

Yes you sure can and its a great upgrade, but as stated by Idcatman, the taper and offset will need to be changed along with a custom bolt and spider shimming specific to your belt and weights. We also build a custom alignment bar for that combo and have solid clutching specs for the 900-1150cc big twins.
We build these conversions daily so feel free to call if you have more questions-happy to help!

Curt

 

[JPM]

STILL OLD TAPER

I am no expert but werent the 800 and i think the first year 900s the old taper which was the same as the polaris taper. I have seen people use the polaris clutch on these small taper cranks, they are not likley as good but it is what he has so i think it will do the trick.

 

[FTXMOTORSPORTS]

Hey JPM, you are correct-I missed that in the beginning post (and I have the nerve to b!tch when other guys miss info in plain sight...geez!)

bolt, puller and alignment bar with 30mm clutch will fix him right up!

Curt

 

[Idcatman3]

The '02 800 and all the 900s have the 33mm taper. Only the '01 800 had the 30mm.