The clutch on my 2006 street glide has been starting to slip when I am really getting on it. I will be replacing it with the alto kevlar kit from Dennis Kirk and am curious if I should upgrade to the heavy duty spring as well for only $30 more. I'm also wondering if I should be replacing the steel plates as well. The motor is stock except for the upgraded andrews cams and intake and full exhaust system.

Clutch
https://www.denniskirk.com/alto-prod...prd/383203.sku

Spring
https://www.denniskirk.com/barnett/h...rd/H380357.sku

 

Would think a stock set of clutch discs and steel plates with new stock springs would be enough for your engine setup.If you go the stiffer springs,you will have a stiffer clutch pull at the handle and that is a killer in traffic.

 

Go with the stock spring, that extra pull is not fun, I went with the police spring and it is stiffer than stock but not as stiff as the Heavy Duty, and it takes a while to get used to.

 

Definitely get the spring, I think it tests out at 330lbs. If I remember correctly, its about about half way between stock (300lbs) and the SE heavy duty(380lbs)

 

You didn't mention how many miles you have on your bike. Unless you ride it alot I would be willing to bet your spring is the only problem you actually have. Be sure to mic the clutch plates and check the measurement against the specs in your manual. The stock springs are known to do what your describing at around 30k miles. Chances are replacing the stock spring will do all your wanting to accomplish.

 

I replaced the clutch innards at around 60,000 miles ('08 FLHT) as it slipped a very little bit on hard acceleration.Installed Barnett extra plate kevlar, and new steels. Used the stock spring with zero problems. Bike is stage one with some other stuff, so basically stock. Easy in traffic, but strong at full pull w/two-up or otherwise loaded.Mid 90's now, still works fine.Then again, maybe the spring really is the only thing you need to change, as has been said. Good luck either way.

 

I have the SE spring, I don't think it is so difficult to pull and I'm no muscleman. For $30, I think it is a worthwhile upgrade.

 

An alternative way ahead is to use an AIM VPC, which comes with a lighter spring, but uses centrifugal force to increase spring pressure as engine speed increases.