M858 clutch kits?

[Suzzy-Q]

Didn't read all 5 pages so perhaps this has been said by others as well...
The ONLY time I can't get at or near 8250 is when the intake is plugged with powder.
At one point I was having some issues and assumed it was simply clutch/belt being too hot because we were working the piss out of the sleds. It turned out that I had some ice build up behind throttle lever and wasn't achieving full WOT.

What elevation you ride? I have the same issue at my elevation (2000-7000’). At this elevation we seem to be needing to load up the clutches more. More weight, more helix, a combo of both.

Stock clutching had lots of RPM 8250-8350. But shift was conservative, sled still went ok. Snyper weights helped out a bunch with more aggressive shift/acceleration and load up the clutches 8150-8250. Going to find a more aggressive then stock helix to try and be able to take some weight back out of the cam arms to retain the most rippy feel I can.

 

[Mafesto]

What elevation you ride? I have the same issue at my elevation (2000-7000’). At this elevation we seem to be needing to load up the clutches more. More weight, more helix, a combo of both.

Stock clutching had lots of RPM 8250-8350. But shift was conservative, sled still went ok. Snyper weights helped out a bunch with more aggressive shift/acceleration and load up the clutches 8150-8250. Going to find a more aggressive then stock helix to try and be able to take some weight back out of the cam arms to retain the most rippy feel I can.

7000-10500

 

[BlueDevil]

I have always had good luck speedwerx. I do adjust weight to my liking but there kit has always shifted well and would hold rpm. The 858 is not working as well as past years. I intend to try a different secondary spring to see if I can help there kit

 

[Old & slow]

What elevation you ride? I have the same issue at my elevation (2000-7000’). At this elevation we seem to be needing to load up the clutches more. More weight, more helix, a combo of both.

Stock clutching had lots of RPM 8250-8350. But shift was conservative, sled still went ok. Snyper weights helped out a bunch with more aggressive shift/acceleration and load up the clutches 8150-8250. Going to find a more aggressive then stock helix to try and be able to take some weight back out of the cam arms to retain the most rippy feel I can.

Reading back on your old posts your clutching seemed off from the factory or mine is. The primary spring was different 85-255 and you had heavier weights 62 gram. Mine came with 58 gram weights and the primary spring 120-265 part #1646-007. Maybe you have an early build as I know the original spec sheet listed the 85-255 spring.

 

[Vern]

Mines a late build, didn’t get it til end of December, and it had 62g weights and pretty sure the 85-255 spring.

 

[rkm]

Didn’t see that. It was posted on the mountain only catalyst page so didn’t even look at it closely.

The new spring for the trail sleds is not what ours came with. The M858 came with a 1646-007 which is listed as NLA and Cat says its under material review.
The spring in the bulletin is from the Team clutch. Which is measure at slightly different heights and should be stiffer than the listed 120/265.

I think Im gonna sit down with my spring tester and play with some springs. My main sled is now pulling down to 7400 at times. Curious if the -007 spring is losing temper when warm.