O.K. I'm going to give it a shot and change my spring next week.
Let me get this straight say the spring (actual weight) is rated at say 10/100
The 1st number the "10" determine's stall correct?
The lower the 1st number means lower stall correct?
So the stock Kawi spring's 1st number is "0" and say stock stall speed is 1000 rpm so Kawi weighted the clutch itself to stall with a "0" spring at 1000 rpm
OK does that mean the second number in this case "100" determine how long the trans stays in ea gear?
So that means if I get a spring that the actual rates are 10/110 then I would stall slightly higher than stock (dont know what the stock spring is rated at the moment lets say for arguments sake that the stock spring is rated at 0/100) and stay in ea gear for a slightly longer time?
Please let me know if I'm thinking correctly I know absolutely jack about these type's of transmissions but have a basic knowledge of how they work.
I do a lot of hard, tight, and up hill trail riding but want more top end but don't want to stop going up a hill and have to ease into the gas and with the stall to high flip the quad.
Thanks Doc.

 

The numbers are a pressure reading at 2 given heights with the first being installed height and the second being full shifted height. If you wanted your wheeler to stall up but still shift the same and keep the same RPMs on top end then you would get a spring with a higher first number and the same second number or as close as possible. Too high of a second number without mods to go along cause the engine to wind instead of pulling against a load. Kevin has time involved with Polaris CVT's also and I can tell you it is not easy to tune them in. Trial and error and usually a box full of parts is what you'll end up with unless someone else figures it out for you[img]i/expressions/face-icon-small-smile.gif[/img]

 

Kevin,

You seem to have clutch, spring, and shim(s) program all working well together. I notice you have the 32/235 springs form HPD do you have any Shims installed with these springs? If so do you mind sharing your size and configurations (shims= .6mm .8mm 1.0mm 1.4mm)?

Thanks

RJ

 

I'm not sure what the actual measured thickness is on the shims, but if you look behind your stock primary spring on the V-Force you will see one of these installed from the factory. With 3 installed I can definitely see an increase in the stall RPM.

 

Kevin,

Sorry I got a little mixed up there is only one size shim behind the primary spring and it is a "92026-1603 SPACER,39X49.5X1.0" according to Kawi.

So you have added two more of these 1mm shims to the stock one to give the bike more stall? Sorry I am a little slow...LOL

Thanks

RJ

 

adding shims will increase the pressure... and result in higher stall speed .... however ... you might also limit movement that will result in the belt not going as high in primary pully ( loose top speed )

 

[img]i/expressions/face-icon-small-blush.gif[/img]

 

Kevinm have you tried the HPD plain 32/235 yet? If so how does it compare to the epi pink ?

 

I'm using the HPD plain with 3 shims now. I put a good beatdown on 2 modified Banshees with it. Bad enough that my buddy with a piped Ratpor said he wouldn't even line up with me again until he had a 686 kit.

Don't expect results like that with the pink. 32/235 + the increase the shims give, compared to 0/160 means less stall, less shiftout RPM's and less wins.

 

Kevin:

I have heard from several people that one should NOT shim the primary as the this changes the characteristics of the spring and it become more suseptible (sp?) to binding. This is from sledding folks but still CVT gurus. What are your thoughts??