At what hp and torque ( give or take ) should you start wondering about doing something with the clutch and or clutch spring ?

 

when they put the 103 big bore kit in my Ultra they changed the clutch spring.

 

also depends alot on your riding style,if your spending alot of time over 4,000rpm think a clutch spring is mandatory even with a stock motor.

 

I have an S&S 107 in my 1990 Evo. The clutch is original and stock, with just a Barnet clutch spring. Motor gives just over 100 HP/TQ at the rear wheel. Your TC should manage significantly more performance than mine with no more than a stronger spring.

 

Not a whole lot over stock HP, if you ride aggressively or carry a lot of weight.

The clutch springs had become progressively lighter from 04 and up. 06 and up are real light. Gave the consumer easier pull.

 

I've been fine so far with just a SE spring

 

You can go quite a ways with the SE spring. That sucka is potent.
Hard on the wrist though, in heavy stop & go traffic.

 

I'm going with a VPC clutch now - no sense waiting to start degrading the rest of the clutch.

I had one on my last bike and loved it.

Mark

 

I have had a couple VPC's they work very well

 

I run the VPC 83T (they now sell them as 84T) along with the 98A clutch spring (lighter than the SE) on a stock clutch. Bites hard at the rev limit, with a nice easy lever pull. I love this set up!