Predator 420

[flyerrider]

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The final option is to purchase an adapter that allows you to run a 30 mm tapered clutch. That allows you to grab a set of used Polaris clutches off of Ebay for your build.

Have a source for this adapter? I'm planning on using the same engine for my son's two seater kid's buggy next year.

[Jerm]

I have used this with a polaris clutch, it fits.
Tapered Clutch Shaft Adapter - 1"

[darwinpayne2000]

There are two setups when using the Polaris clutches.

The ATV driver/driven clutches are a smaller diameter than the snowmobile clutches. The ATV driven clutch is a splined shaft, so it typically works best with the ATV FNR transmission. The snowmobile driven clutch, at least on the older Polaris models, uses a 1" keyed shaft.

The driver clutch from a Polaris Trailboss/Trailblazer with the 250/330/335 engine would have a spring and weight setup that would work well with your engine. The Polaris snowmobile clutches are configured for engines with more horsepower, so you would want to swap out the springs and weights with a lighter setup.

Good luck on your build.

[Jerm]

Darwin is correct, he has alot of good information on this topic.
I found that you will need a weak spring on the drive clutch, its the black spring. Also on the driven clutch I was told the Red spring. Both are weak, because the RPM of the 4stroke industrial engines is not as high as the Polaris ATV or Sled that it came off of. So a weaker spring gets it to open sooner at the lower RPM's. Perfect for the industrial style engines.

[Texan77]

So for a snowmobile clutch I would need an adapter for tapered shaft to straight shaft and for atv clutch an adapter for splined shaft to straight shaft?

[Jerm]

No, both clutches are tapered, you need the tapered adapter for either a snowmobile or ATV primary clutch.
Use a Polaris forward/neutral/reverse gearbox from any of the polaris ATV's, the secondary clutch is mounted right to the gearbox and it has a sprocket on it for output. It is an ideal setup for that engine. Then ues the matching polaris primary clutch on the engine.

[Lug-Nuts]

So?

How is the build coming along?

Pics?

[Texan77]

I'm finishing up a few things and starting to paint. I'll get some pics soon.

[Lug-Nuts]

Nice, Im thinking about sand blasting mine and re-painting.

Maybe next year