An alternative to consider, for reduced lever pressure, is the AIM VPC. Rather like the Rivera it uses centrifugal bob-weights to apply increased pressure at speed, while using a softer than stock clutch spring. I have one, but haven't installed it yet.

 

Makes me want to build another fxr.

 

pulled the primary today on the new donor bike and was somewhat surprised to find a Primo in there with a variable spring plate.

I think that the basket is also a Primo though I can't find anything in their catalog resembling this. If I had to guess this is a 94-97 setup judging by the 36 tooth basket. clutch pack looks like it will fit 90-97 oem harley clutch basket. I have the matching comp sprocket off this bike also (was not running a comp eliminator) so I am not worried about the primary ratio.

but here's the thing- the whole assembly is a lot taller than the stock setup. even with out the variable plate it sits a lot taller. I don't have my inner primary on yet because I'm still waiting on my trans sprocket so I cannot check the clearances. everything is in pristine shape.

Any thoughts? drag specialties states that this hub/variable plate will fit in the OEM primary. So I may have to end up pulling the hub and putting that in the OEM clutch basket. What do you guys think?

 

Believe it or not Im running the stock HD plus one clutch on my 121" with no problems

 

I'm running the Rivera set up, you only need a spacer that moves the Derby cover out and a inner and outer gasket

 

Your going to like that 113", that's a sweet spot for ***** and longevity on S&S motors. Compression releases recommended depending which cam it has.