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Help selecting shoe springs
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Posted by: yfz450inMI

It's an Xtreme 90cc. Mods are Hetrick pipe, stock carb rejetted, clamp-on Uni filter with Outerwear.

Hetrick sent me a 1500 rpm rear torsion spring, and 3 different sets of shoe springs.

What ones should I install? Why?

Yellow = 1000 rpm
Blue = 1500 rpm
Red = 2000 rpm

Posted by: bigdaddy

Try the red ones. It will give you a harder hit off the line. We were using the yellow torsion spring with red shoe springs with that pipe and it worked great. Be careful changing the little springs so you dont poke a hole in your thumb when the tool slips

Posted by: Arctic Cat Dad

When I installed our Hetrick clutch kit I asked Rich what springs to use. He hit everything right on the head. We run the red torsion spring and the red clutch springs on our 70cc quad. I like the red springs in the clutch. It lets the engine rev up before it hits in. This lets him come out of the hole with alot of power and no bog. This set up has gotton ALOT of Holeshots.

You might want to call Michele and have her ask Rich what he thinks. He will get it right for you.