Primary Help?!?

[Skionlrghills88]

Hey guys, thanks for all the help with the secondary issues I was having, I rebuilt the entire thing after i thrashed it, new ramps, helix and spring and the thing is working like a top. However my sled is still suffering from over reving like it was before. Turns out its an issue with the primary. The weights are weighted to factory spec (for altitude) and rivets are not catching on the rollers and the thing closes all the way with the belt off. But its slipping pretty bad at high speed and the belt is only going up to an inch below the top of the clutch, im sure it should be getting higher, not sure where to start with this one? The sheaves have a defined wear line at the max height the belt gets too, but i dont think thats keeping the belt from going higher its not major wear. The clutch has been blown out with compressed air multiple times this winter so its "pretty clean"

ps i have a brand new belt on so its definitely not belt wear

 

[MikeWalters]

The rivets are not supposed to catch on anything.

How much over-rev are you talking about? What is your secondary set at, and what track are you running?

Phazers have this problem in general, poor clutching from factory. Everything you described sounds normal to me. Let us know some more info and maybe we can help.

 

[Skionlrghills88]

Secondary is in b1 stock for mtx. 144 track. I ment the rivets arnt catching on anything. I'm hitting rev limiter at 51 mph / at about 1/3 of full throttle. I'm thinking the primary belt should be going higher than one in from the top. Ive tried C1 secondary and didnt see much difference

 

[MikeWalters]

Are you talking about the rivets within the arms? There are 3 holes in your arms that have "rivets" in them, the rivets should not hit anything.

I think we are having a terminology misunderstanding LOL.

Are you certain your secondary was twisted (pre-loaded) correctly when you put it together?

 

[Skionlrghills88]

forget the rivet thing, i just wanted to clarify that wings are flying open correctly and that nothing was catching. Usually the first thing people ask in cases similar to this. (on a related side note the mtx weights only have 2 holes)

I'm gonna venture that my secondary is assembled correctly, there is no way i could get the helix to the ramps one past or one before the ones they pretty much line up with, just a small twist to get them on and done... Im gonna go back to my original theory and say its the primary, if the primary is slipping and not pulling the belt high enough (almost over an inch from the top) then on the secondary it wouldnt be tight enough to pull it down all the way therefor lack of top end and over reving. The primary gets way hotter then the secondary and I have a defined wear line from belt slipping. I dont have rubber residue as I hit it with a scotchbrite pad regularly, im debating hitting the sheaves with some sandpaper to eliminate that wear line altogether. I guess thoughts are what can cause the primary to slip? not enough weight? damaged sheaves?

 

[jake151]

The belt should go within a 1/4 of inch of the top of the sheave on the primary. What belt are you running and what is the number on the weight or arms, they should be 8DN 10s

 

[Skionlrghills88]

I looked at the weights today they are the 8dn10s and i have the heaviest rivets in both holes. Im currently running a brand new 8GK (replacement of the 8GS I understand) I also have a used 8GS and A new 8DN (nytro belt). Here is a pic of the clutch, you can clearly see how high the belt is going.

 

[Voda2000]

Have you checked the center to center distance between the primary and secondary to see if it is in spec?

 

[canoehead]

You could try cleaning the clutch with Scotchbrite pad and install a Carlisle belt. I definately see indications of high temps on the clutch face. The Yammie belts are so hard they slip like shite through a goose.

 

[Skionlrghills88]

I measured the distance between the clutches, its good to go, and i hit the primary with a scotchbrite pad all the time, doesnt really make much of a difference as far as belt height. Something is really wrong but I keep going though everything and its within spec...im getting really frustrated with this stupid thing. Im running out of things to check and adjust...

 

[MikeWalters]

not sure what to tell ya,

your primary really doesn't look bad....?

maybe disassemble it amd check all the rollers etc? or did you do that already ?

95% of the time we get secondary issues. aside from adding more weight my primary has been great, before & after mods.

any of your family/friends clutch pros?

 

[cannondale27]

Mark and remove primary cover plate and spring.Check that sheave is not binding.Check your spring is it correct?If all that is good go with heavier weights.

 

[jake151]

Hi, I know you have been through the secondary, But I still think it's an issue. I think it's wound to tight. I had a over reving problem I changed to 8DN 20 arms and 3.6 gram rivits in both holes. I'm running a 51/43 helix with a green spring wound 3&3 or 60 degrees in a reverse secondary clutch. It turns about 11,200 rpms and might back off to 10,800 rpms depending on the snow condition. I have had no slipping problem with the 8GK belt

 

[pat the rat]

I looked at the weights today they are the 8dn10s and i have the heaviest rivets in both holes. Im currently running a brand new 8GK (replacement of the 8GS I understand) I also have a used 8GS and A new 8DN (nytro belt). Here is a pic of the clutch, you can clearly see how high the belt is going.

From that pic,it looks like there is way too much gap between the 2 sheaves,did you take it apart