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I found this simple guide courtesy of Bikeman performance , It gave me a better understanding of how the different components work, obviously people that have played with CVTs for years will already know this stuff but for people used to gears and chains this gives abit of a head start !

CVT CLUTCHING
Here are some genral clutching rules you should play by!


Primary clutch (Drive Clutch) = Front clutch off the motor

Secondary Clutch (Driven Clutch) = Rear clutch connected to drivetrain

Peak RPM = The RPM the machine sits and holds at most of the time at WOT. This needs to be in your model's peak powerband for best results. BMP Supplies you with your optimum peak RPM when purchasing clutch kits.

More Primary Clutch Weight = less peak RPM

Less Primary Clutch Weight = More Peak RPM

Primary Spring Starting Rate Controls Engagement - Higher the starting rate, the higher your engagement(stall) RPM will be

Primary Spring Ending Rate - Controls Up Shift, Back Shift & Peak RPM

Stiffer Primary Spring Ending Rate = Slower Upshift, Quicker Backshift, More Peak RPM

Softer Primary Spring Ending Rate = Faster Upshift, Slower Backshift, Less Peak RPM

Steeper Helix Angle = Faster Upshift, Slower Backshift

Shallower Helix Angle = Slower Upshift, Faster Backshift

Stiffer Secondary Spring Finish Rate = Slower Upshift, Faster Backshift

Softer Secondary Spring Finish Rate = Faster Backshift, Slower Upshift


Adding horsepower means you need to add clutch weight, go steeper on the helix angle, or both. Most small modifications only require adding clutch weight while larger horspower modifications will require you to change both. Not changing clutching when you add horsepower will result in over-revving.

On some 2 stroke snowmobiles you must add clutch weight or RPM will be too low. 2-stroke pipes are made to work when they are hot. If you do not load the motor hard enough, not enough heat will be built up in the pipe which will result in poor running condition and lower than normal peak RPM. This is about the only case when low RPM is seen, and weight should actually be added.
 

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I want to commend you on finding this info. Most of us are gear heads but are unable to wrap out heads around the cvt concept. This is the basic cheat sheet to unravel the mysteries of the cvt. GREAT FIND!!!! this should be a sticky !!!!!!


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Yea what he said^^^^ awesome find!!
 

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I want to commend you on finding this info. Most of us are gear heads but are unable to wrap out heads around the cvt concept. This is the basic cheat sheet to unravel the mysteries of the cvt. GREAT FIND!!!! this should be a sticky !!!!!!


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I agree.
 

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As so do I ^^^^^^^ good job!
 

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Discussion Starter #7
Cool, Glad it helps as it did me !


From ' The Land Down Under ' .
 

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2020 X3 RR
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Wondering what your suggestions are for primary and secondary spring to go along with your weights for the X3. I am running 32" tires and need to get my rpms back up. I like the fact that yours is adjustable.


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We are currently working on developing spring options. We'll post it here and on Facebook when we release them.
 

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It seems like most of the clutch kits out there raise the "Peak RPM" (good for duning) while also raising the "engagement RPM" (bad for slower trail/rock crawling). Is there a way to raise peak RPM while keeping the engagement at near stock levels (~1700RPM)?
 
2020 X3 RR
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It seems like most of the clutch kits out there raise the "Peak RPM" (good for duning) while also raising the "engagement RPM" (bad for slower trail/rock crawling). Is there a way to raise peak RPM while keeping the engagement at near stock levels (~1700RPM)?
It's tricky to do but is possible to a certain extent to get a lower engagement with a spring while raising peak RPM. You'll want to fine tune more with your clutch weight placement versus spring rates though. Ideally running a softer spring rate and adjusting peak RPM with clutch weights results in greater clutch efficiency.
 

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Bikeman I am extremely interested in your clutch weight setup and waiting to see what you come up with on the springs. I am familiar with the magnetic setup from my uncles xpt and i like the adjustability. I need to get the rpms up with the 32" tires but I do a lot of rock crawling so don't really want to raise engagement.


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I know I like them and the adjustable. I just think I will need springs to go along with them. If you need a test dummy for springs let me know.


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