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.
Edit mine did come with 62 gram weights

 

[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.

 

[Sleddinhunter]

I was only hitting 8k while riding at 7000 -10000+. I replaced the 62g weights with 60g’s. Everything else is stock. It seems snappier and now hitting 8150-8200. Amazing the difference. Still engaging at 3400 - 3500 rpm.

 

[turboless terry]

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

Mine was 62g weights. A 120/265 and a 180/240.

 

[Vern]

Mine was 62g weights. A 120/265 and a 180/240.

I’ll have to double check when I put the stock stuff back in, but coulda swore it was the 85/255. Could be mistaken though. That secondary spring sounds right though. I might leave the 190/260 bdx spring in that came with the Ibexx kit when I put the stock helix back in.

 

[Old & slow]

I must have been in a brain fog this morning mine also came with 62 gram weights. Just the primary spring was different. Sorry for any confusion.

 

[Vern]

Terry was right, mine was also 120/265. Must’ve been thinking of the adapt I put on my ascender.

I put my stock helix and weights back in but kept the 105/280 and 190/260 springs from the Ibexx kit, and should be getting my bad shock replaced tomorrow so hopefully I’ll get to test it out this weekend. No angles written on the Ibexx helix, but it definitely looks quite a bit shallower than the stocker

 

[Driver]

Aftermarket companies never tell the helix angles they are using, its a trade secret.

But basically they are all the same, steep helixes and stiff springs.

 

[Vern]

I did a very crude and inaccurate measurement on the Ibexx helix so I could be way off, but I got close to 42 degrees.

 

[ratlover]

Aftermarket companies never tell the helix angles they are using, its a trade secret.

But basically they are all the same, steep helixes and stiff springs.

Speedwerx engraves theirs

 

[Driver]

Speedwerx engraves theirsView attachment 430579

Thats great transparensy. That being said, if thats a mountain clutch kit, its an insane steep helix once again.

 

[ratlover]

Thats great transparensy. That being said, if thats a mountain clutch kit, its an insane steep helix once again.

Does the compound cut make much difference in how it acts? Or is its final of a 49 pretty much make it not much different than a straight 49?

And yes mountain high altitude kit. Weights are supposed to be stock profile adjustable. Going off my crappy memory but I think 61 grams with no screws in them.

 

[MTN_VIPER]

Steve at MDS will tell you what helix comes with your clutch kit as well. I understand why some companies don't mark their helixes, but at the same time I want to know what I'm buying. I usually like to do my own fine tuning and if I know what I'm working with, it makes it easier for me to make fine adjustments for my riding style and conditions.

 

[Driver]

Does the compound cut make much difference in how it acts? Or is its final of a 49 pretty much make it not much different than a straight 49?

And yes mountain high altitude kit. Weights are supposed to be stock profile adjustable. Going off my crappy memory but I think 61 grams with no screws in them.

So the start angle is 64 and end angle 49. It does give kick in the start but mostly you will be riding that 49 angle as transition is really short. So basically yes its almost same as straight 49.

 

[Sage Crusher]

Just an FYI- I have seen companies that stamp the final rate first and initial last.. Why? But I have seen it a lot of times.
The transaction length can vary, and I have my Helix's cut from Venom @ .20- Just a preferred preference, so it doesn't hang in the initial very long.

 

[Suzzy-Q]

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.
Edit mine did come with 62 gram weights

Very well could be, I picked up my beast Nov.2nd but could have picked it up two weeks prior.