some thoughts on secondary of xp

[lightening800]

wasd out riding yesterday and i think the secondary helix angle is too shallow, if tuned many sleds in the past and this one when on full throttle you can hear and see the rpm hunt up and down, i think the helix is trying too hard to backshift as the primary is trying hard to upshift. I think if we try a steeper angle helix or progressive helix like a straight 44 or a 46-40 or so this rpm hunting and belt issue would be solved or at least helped a bit. Has anyone else experienced this as well??

 

[winter brew]

I think throwing more weight at the primary would sort of address the same issue, just working it from the other end. And the set screws are alot cheaper

 

[Original Tetonice]

In the snow we were in today 12" of fresh over a good 3' base. I was hammering the straight 42 all day long it it was working great...im a multi angle fan as well, but so far so good for now....Once i get 300 to 400 miles we'll see than,. For all now all is good with the XP.

OT

 

[lightening800]

xp

i actually added a .7gr setscrew already and it still hunts and feel it doesnt load the motor enough, i may try a softer finishing spring in the primary first alos beforw i go but a 200.00 helix.

 

[H20SKE]

Make sure your belt deflection in the secondary is right. The cord in the belt should be right at the top of the sheave on the secondary. It will change probabley several times while breaking it in--keep a eye on it. This is very important on this sled--my 1000 is very picky on this as well--if it is not performing as it should--this is the first place I look now. Not like the old days where you hardly touched the secondary except to clean it.

H20SKE...

 

[LRD]

wasd out riding yesterday and i think the secondary helix angle is too shallow, if tuned many sleds in the past and this one when on full throttle you can hear and see the rpm hunt up and down, i think the helix is trying too hard to backshift as the primary is trying hard to upshift. I think if we try a steeper angle helix or progressive helix like a straight 44 or a 46-40 or so this rpm hunting and belt issue would be solved or at least helped a bit. Has anyone else experienced this as well??

You may have analyzed this right on the money!!!

IndyDan did a long thread (50 to 60 pages) on the Team in March 06 http://web.archive.org/web/20060317...etalk/messageview.cfm?catid=3&threadid=252783
about why the Team needed larger helix angles than anybody thought they needed because a larger diameter helix like the Team has need for steeper helix angles to shift the same as smaller angle, smaller diameter helix of all other clutches. Has to do with leverage applied to the rollers on the helix ramps when at different distance from centerline of the clutch. The Supertoquer has varied diameter to use this effect like a variable angle helix I think. To complicate things all the various brand sec helix are measured a little different for comparison, you can take a helix and measure the angle on the inside and get one #, down the center (average), different # and around OD and get another # again. So a doo 50 will be different from a cat or pol even if cut at the same angles.

If Dan had it right the QRS with its huge OD helix (over 4" and old doo about 3.5") should need steeper Helix angles than previous doo's and more in line with what works in a Team but it has similar angles to the old doo sec.

I am longtracking a TNT and very early on started looking at all helix and springs for the all the XP's trying to make a half way intelligent guess for what helix angle with it longtracked. My conclucion was doo didn't have a very good clue on clutching or else the QRS worked differently or so well that it could use nearly the same helix angle for all applications. With whats been happening I don't think doo has a clue on clutching again. Shockwave is working on an adjustable helix for the QRS and was hoping it would be available before Jan 1 but probably not going to happen. Adjustability with an allen wrench in seconds from 34 - 36 -38 -40 -42 -44 -46 -48 - 50 would figure this out real quick.

Good Luck

 

[SWEETXPBEATCH]

Secondary helix

I have been calling for a different sec helix due to previous experience with this clutch. Adding pin weight would make the most logical sense. The problem is, I am not getting enough R's & keeping my clickers where I want them. So.... change primary spring & secondary helix. All of course, after that 2-300 mile mark...

 

[lightening800]

sec

i ordered a blue/blue spring for mine today will be here on trurs, which is a 130-290 lb. the factory is a 160-320 pur/pur so we will see if the weights can over come the spring tension ans secondary shift with this spring, all i know it feels like the engine isnt getting loaded enough and it feels like the clutches are stalling against each other, just compare to previous revs and this one is weird.