When Clutches Slip
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Road Warrior
Joined: Mar 2007
Posts: 1,377
Likes: 8
From: Atlanta, GA
When Clutches Slip
I was on the highway today putting my latest engine upgrades through the paces. When I put my engine under load at 75MPH + (Really officers, I was not speeding) or drop to fifth to pass the clutch starts slipping. No issues anywhere else yet; just the highway. I intend to readjust my clutch, but here are a few questions anyway.
Since I am running the 107 kit with stage 2 heads and the stock clutch. I am probably on the edge where I need to get an SE clutch spring or a VDC - This thing: http://www.eglidegoodies.com/id156.html .
With the SE clutch spring, will the clutch pulling effort increase? If so how much? I am weighing whether to go with the VDC which has great reviews. Thoughts or other assorted ideas are needed.
Since I am running the 107 kit with stage 2 heads and the stock clutch. I am probably on the edge where I need to get an SE clutch spring or a VDC - This thing: http://www.eglidegoodies.com/id156.html .
With the SE clutch spring, will the clutch pulling effort increase? If so how much? I am weighing whether to go with the VDC which has great reviews. Thoughts or other assorted ideas are needed.
A SE clutch spring is a good start; I would also go with a VPC. I was also told to stay away from synthetic primary fliuds by a few professionals. Also, I'm suprised that your tuner didn't notice the slippage on the dyno. Normally, the dyno chart will show slippage before you'll actually notice while riding.
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Road Warrior
Joined: Mar 2007
Posts: 1,377
Likes: 8
From: Atlanta, GA
I am tuning using TTS. I use conventional 20w50 oil in primary. I never had issues with it. With the SE clutch spring, I'd like to understand whether clutch pull effort increases.
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
Assuming your clutch pack is sound(just because it wasn't slipping before doesn't mean it's sound if it's old)a 340 or a 380 spring will be necessary. A VPC only works at about 3000+/- so you still need a decent spring, and your stock spring isn't going to cut it AT ALL. The spring you have was designed to be the lightest pulling spring they could get away with. Its less than 300lbs. The VPC has another side benefit of lowering the pull at 92% or an 8% reduction in pull with the VPC92. If you need the lightest pull you can and be certain it will hold, get the 340 with the VPC92 and a fresh clutch pack. AIM rates that to hold a 120r with a sound clutch. I am running that and it pulls fairly easy. I have a SE heavy spring for when I do my clutch plates, I will still use the VPC on top of the SE spring. Yes you will have a heavier pull on the lever. No way around it unless you pop for a hydraulic clutch.
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Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
Gotta pull the whole outer cover, gasket can be reused if desired, it's almost 40 bucks!
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Tourer
Joined: Jul 2011
Posts: 354
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From: Indianapolis, IN
Is this different on the twin-cams or due to an upgrade? I pulled mine without taking the primary cover off.