If I install this variable clutch, should I use the stock clutch spring or heavy duty clutch spring which I already have? 07 Dyna Streetbob Thanks!

 

I went with the SE spring. I can't tell if it's any harder to pull or not.

 

Does it mean you have SE variable clutch in conjunction with SE spring? How do you like it?

 

Yes. The AIM Co. makes the VPC for Harley Davidson. I can't tell the difference because the VPC facilitates easier clutch pull unless you're really revving the hell out of the motor.

 

on my 107 kit from fuelmoto, I originally went with just the se spring. the increased pull on the clutch made low speed 'friction zone' maneuvers a pita. after a couple of months, I went with the aim v92 vpc (which is basically the same as the se vpc) and went back to the stock spring. clutch pull was greatly reduced, probably even easier than stock, but the vpc held great. I didn't have any headwork done, but I was making 98hp, 124tq. so unless your 107 is making way bigger numbers, I would go with the stock clutch spring. if you do find it slipping, it is easy enough to change springs.

 

Thanks dude!

 

Great comment man! Same boat here FM107 no head work. Since I installed the SE spring, so hard to pull, almost impossible in traffic. Then I installed Burley easyboy, easy operation but clutch friction zone never felt right. What about higher rpm clutch engagement? Acceptable? I ride pretty hard, clutch/shift anywhere between 4000-5000rpm. BTW if you don't find slippage on your bagger, I don't think I will lol. Thanks Alex

 

When I had my motor done by FM, I went with the heavy duty clutch spring. It was really stiff and killed my hand. I bought the AIM VP and put the stock spring back in. Much easier to pull and I noticed zero slippage. My bike was making 112/122 with the 107, headwork and 777 cams.

 

I'm running a VPC with the Barnett Spring (the lighter one, not the heavy duty one) and it works great. I probably could get away with the stock spring, but the pull at the lever with this setup isn't too bad.

I ran the Barnett HD spring for awhile with no VPC. Way too stiff. I had that setup when I went to Sturgis in 2013 and it was terrible.

 

true that with the design of the vpc, clutch pull does get harder at higher rpms. however, at higher rpms you are not trying to do friction zone stuff either, more of a pull and release. I had no problems with mine. in fact, really hard to tell that the pull was really all that much harder.