Team Primary on Winder secondary mocked up

[KnappAttack]

EPI purple is a Cat spring, they also sell it as a Yamaha spring now too as so many were using it in their Yamaha's in the past anyway. Any Cat spring will work in a Yamaha driven clutch, the tangs will be in a different location than the Yamaha guys are used to. You can check the spring pre-load as you would do on a Ski-Doo. The Purple EPI set at 0-1 is 24.5# cracking pressure on mine.

 

[ROCKERDAN]

Mike, do you feel 24lbs "break" is where you want to be?

I realize all springs have diff torsional and compression rates, so not all will be same 'break' point.

Great work here Mike,
Dan

 

[NYTurbo]

Not sure that 24 is enough. You'll know when you try it.

 

[KnappAttack]

Mike, do you feel 24lbs "break" is where you want to be?

I realize all springs have diff torsional and compression rates, so not all will be same 'break' point.

Great work here Mike,
Dan

No Idea till I get out and run it Dan, should be this Thursday with the Yamaha primary, I'll find out soon enough I guess, should be a good place to start though. Starting with 41-37 which didn't backshift all that great on Dalton Black/Orange in warm weather. Have the 39-35 to go to if need be, but with the higher side pressure driven spring may be just fine. Have even heavier springs to try as well and I want to use heavier along with more helix. Should be just like running the compression springs in the Doo's with the added side pressure, figure it will be a good compromise between compression and torsion setups. Remember how great those big CR9 helixs were with heavy purple Doo compressions? thats more what I'm after with the Winder, but doing it with higher side pressure Cat torsion springs.

 

[ROCKERDAN]

No Idea till I get out and run it Dan, should be this Thursday with the Yamaha primary, I'll find out soon enough I guess, should be a good place to start though. Starting with 41-37 which didn't backshift all that great on Dalton Black/Orange in warm weather. Have the 39-35 to go to if need be, but with the higher side pressure driven spring may be just fine. Have even heavier springs to try as well and I want to use heavier along with more helix. Should be just like running the compression springs in the Doo's with the added side pressure, figure it will be a good compromise between compression and torsion setups. Remember how great those big CR9 helixs were with heavy purple Doo compressions? thats more what I'm after with the Winder, but doing it with higher side pressure Cat torsion springs.

I hear ya, and was thinking same thing. That big purple compression woke up the 1200 bigtime for me, and seems to work well for my 900t bud now too.(4 or more sled lengths)

Dan

 

[STAIN]

I have the Cat green and red/white on the bench right now to test. Hopefully soon

 

[STAIN]

Well you guys talked me into it. A/C green at 40 degrees. Straight 40 helix. May need some more primary weight.
I used to run an EPI purple on my turbo Viper and that always had great throttle response. Maybe it what it wants. You don't know until you try....

 

[1049triple]

You picked up my interest with those springs. I should get both stiffer primary and secondary springs tomorrow. Right now clutching is good on the hard pack, but anytime I hit 4'' of loose snow and running at speeds above 90mph and pushing it, black markings show up on the inside sheaves only of both clutches at from around 2/3 to full shift. Tried differents set-up and always the same. Then clean the clutches and stay clean and warm until I hit loose stuff at high speed again.
I know I am in the need of more pressure control in the primary, but never tought that the stiffer Dalton wont be enough for the secondary. EPI purple here I go. Cant imagine how hard that big bitch would be to put in the clutch. I will give it a try.
Do you think that 21/41 with 8t 3'' 1-3/4 track is really in the need of that much secondary spring?

 

[STAIN]

Cant imagine how hard that big bitch would be to put in the clutch.

I have to put it on the floor and install it with my knee. I don't have the stones to do it on the bench.

 

[ROCKERDAN]

I have to put it on the floor and install it with my knee. I don't have the stones to do it on the bench.

Can you check the pressure lbs for me? Just interested to see what is needed to get belt to actually come back to top on a stand. Gotta be over 20lbs break.

thnx
Dan

 

[1049triple]

STAIN, is that the Black/Bronze or the Black/Teal you have in that primary?

 

[STAIN]

I don't have a really good way to measure the pressure. I am sure it is over 20lbs. It seems to be a little stiffer than the EPI purple.
157lbs vs 148lbs at 1 7/16

 

[STAIN]

STAIN, is that the Black/Bronze or the Black/Teal you have in that primary?

Bronze. I have the green also but have yet to try/need it.

 

[Crossfire12]

EPI purple is a Cat spring, they also sell it as a Yamaha spring now too as so many were using it in their Yamaha's in the past anyway. Any Cat spring will work in a Yamaha driven clutch, the tangs will be in a different location than the Yamaha guys are used to. You can check the spring pre-load as you would do on a Ski-Doo. The Purple EPI set at 0-1 is 24.5# cracking pressure

How do you measure cracking pressure? I use a fish scale and bar or vise grips off the moveable sheave, pull on it and measure force.

 

[KnappAttack]

Measure cracking pressure with a vise grip attached to the driven with a rubber pad under it, then use a fish scale with on the sheave edge.

Guys doing heavier driven springs, old Cat trick that works just as well on Yamaha, put a roll of duct tape on the ground and use your knees to grip the outside of the driven, installing heavy springs is an easy one man job this way.

These higher side pressure springs bring the belt back to the top of the driven like it should and take the ballooning out of the belt. I'm also trying the 8DN this weekend and it too allows it to backshift better with the higher side pressure springs. Throttle response and belt grip in the secondary will be MUCH better. I have a hunch we have been running too light of side pressure in the winders and needing that low angle helix to compensate. My feeling is the lighter driven like the B/O is fine for ice or road running but not enough side force for trail or snow use.