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Discussion Starter #1
I have a 97 zrt800 and i'm having a problem with clutching. I have ported 900 jugs on it with stock pipes.  Primary has polaris red with stock weights. secondary has yellow with green stripe in fourth hole with a 64 60 helix.  It pulls like a bear on the top end but lays down out of the hole.  I' looking for help on a ice set-up and gearing, any help would be appreciated.
 

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Do you have the stock gears in?  Are you looking for a 1000' clutch set up for speed runs, or just all out top end?  WHo did your porting?  Where is your engagement at now?
 

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It sounds like your sucking the belt down in the secondary clutch off the line. That can be caused be to much helix from the start (your 64 deg) or the secondary spring is to weak (you need more side pressure).
So you can install a new helix less than 64 or install a secondary spring with more side pressure, or you may need to do both to keep the belt from sucking.
I'd go with a 60/54 helix.
A purple EPI secondary spring.
Polaris 10-62 prim clutch weights.
Maroon EPI primary spring 185/320
Gear 23/40 and you can use your stock chain.
If it over revs, install the purple EPI prim spring 185/275
I'd look to shift your sled at 8300~8500 rpm.
For springs,EPI site:
http://www.erlandsonperformance.com/index.htm
 

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Discussion Starter #5
I don't think the belt is being sucked .  I have stock gears in it 24/39.  the engagement is at 4000.  At 600 feet the rpm's are at 8800 to 9000.
 

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If you take off hard (drag racing) and the sled lays down in the first 50' and then takes off, it can be the sec. clutch overshifting and what you may feel is the engine trying to catch up. We ran almost the same engine setup as yours at the 600'~660' radar runs last week on a 96 ZRT. The 64 start deg. on your helix sounds tall to me. It's not hard to find out if it's too much helix, just put the stock helix in and see if it still lays down out of the hole, don't hold it open to long it will over rev. Let us know and send more info.....
 
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