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Discussion Starter #1
Can anybody give me a little walk-thru on how to tune my clutch for top-end? I would Like to gain some topend, but need the help on how to do it.
Matt
 

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There are 4 ways to accomplish more top end.
1. Primary clutch spring with a higher spring rate
2. Primary weights with a less aggressive curvature
3. Secondary spring with a higher rate but same pretension
4. Less Helix angle.
I was reading up on this last weekend since I am adding a set of Heavy Hitters to my sled this season. I'm not that smart just what the Aaen clutch tuning handbook said.
 

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Discussion Starter #3
What is Helix angle?
How do you change the Prim. clutch spring rate? Is it easy?
 

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The Helix is the round object in the middle of your Secondary / Driven Clutch. They come in many different angles or a combination of Angles.
To change the spring rate you will need a different spring. The rate is determined by the wire diameter and how long it is along with how much pretension is built in.
I would highly recommend picking up a clutch tuning book like Olav Aaen's, its only about 75 pages and does a real good job of describing the basics of clutching.
 

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Discussion Starter #5
Ok.. thanx guys!
But where can I get a new spring to change the spring rate? How much they run?
Matt
 

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Springs are cheap, like $20. You can get them from your dealer, Dennis Kirk, Royal Distributing, SLP, just about anybody.
 

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Discussion Starter #7
Ok.. so I want a spring for top-end..
what do I look under in Dennis Kirk or a local dealer..
Like.. I walk in.. what do I say to him?
What rebound am I gonna want?
Matt
 
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