96 Zrt 600 Clutch Spring/weight ? [Archive] - Snowmobile World : Your #1 Snowmobile Forum

: 96 Zrt 600 Clutch Spring/weight ?

96ZRT600 XXX
01-28-2008, 09:11 PM
Hey All:

I recently put a comet 108EXP clutch in my sled (96 ZRT 600), loaded with a CAT yellow/white spring and Comet A-54 (54g) weights. The sled is engaging at 4500 rpm and I want 5000 - 5200 rpm's. Not sure what to do??????
The comet info I have says to put a comet red spring in with A-25 49g weights and engagement is suppose to be around 5000 rpms. But the red spring spec's lighter than the CAT yellow / white. Should I try the 49g weights with the yellow spring? Will that change the engagement without hampering top end rpms (8500 rpms)?

I don't want to spend alot of time pulling the clutch apart 5 times. There is snow on the ground.

Please advise?????


01-28-2008, 09:28 PM
the 49 g weights are what seems to be the choice of a lot of tuners as most kits for that model came with some version of 49-49.5 g weights with whatever spring goodwyn black epi grey , then a more aggressive helix . btw if your turning 8,500 you are over reving a stock motor 8,250-8,300

96ZRT600 XXX
01-29-2008, 07:33 AM
Thanks SnoFrog. I will try the 49g weights and see where she engages at (hopefully 5000 -5200). Where does your ZRT engage at? and with what setup?
The 8500 rpms was rough, she was turning a constant 8300 and every so often she'd pull 8500. That was running lean also (running 340 mains and pulling plugs every other run down the ice). I'm slapping in 350's this week to see if I can fatten her up!!!
Thanks again.

96ZRT600 XXX
01-29-2008, 08:48 AM
I do have anyother question regarding belt deflection. How do you decrease / tighten the belt deflection? and how do I get my belt to ride a little higher on the driven pulley (right now belt is flush with the top of the sheaves).

01-29-2008, 03:45 PM
with black goodwyn spring and 49.5 g notched weights it was right at 5100 rpm . to increase deflection split your secondary and pull a shim from there . there should be different thicknesses in there so its a trial and error thing to get to your desired spot 1/8th I assume . M

96ZRT600 XXX
01-30-2008, 12:31 PM
Thank you SnoFrog, I will let you know how it goes.