The stock spring might be a little soft for your build. It might slip. It did in my situation. If you have issues with your clutch hand, get the -98A spring (should be easier on the hand than the SE).

 

I would also agree with dawg to the extent that a simple spring change will offer less effort. The Harley habit has been to install a much stronger spring than is needed for the average riding public. They would rather have a heavy spring to prevent slippage complaints from people that ride them like they rented them, but most people don't.

The real positive for the VPC is that it can be installed through the derby cover in around 15-minutes with no loss of oil.

 

His 103 with tw6's would slip for sure with a stock spring. I'd hate to see him find that out in the Colorado mountains. Those 06 and up springs are pretty soft.

 

Ok I am pretty sure I already have the lighter weight spring in there, because the builder didn't use the one supplied with the Harley 103 kit. This spring is still too stiff for me. Based on that what would you guys recommend I do.

 

I guess the best of both worlds is to keep the strong spring and go with a VPC, but dawg makes a good point on the cost issue. $30 for a spring vs. $300 for the VPC is no small consideration.

I have plenty of friends on 96" bikes with the soft spring and have no issues with slippage in the mountains, but then again....they are box stock with no engine work. I suppose it is possible for Justin to go with the softer spring and just not "use all he has", or go with the VPC to solve both issues.

Just because he has hand issues should not keep him from playing with all the motor he has and it looks like his only way around that is the VPC if he is uncomfortable with his clutch pull. I am stepping out on a limb and saying the 70 would work and give him the full benefit of the least clutch pull. I ride a 1200 pound trike (Stage II TC-88), a wife, her baggage and a fully loaded trailer with a 70 over an SE spring and have never noticed any slippage.in the Rockies or anyplace else.

 

Justin...I just saw your post concerning the spring you have in there now. If you have the stock spring in there now and still have issues, the 83/84 will offer around a 20% reduction where the 70 will offer a 40% reduction. I'd say that since you have no slipping issues now....go with the 70. At higher RPM any of the VPC's will lock the clutch up tighter than the spring anyway.