what is the general norm on helixs?

mopar1rules

mopar1rules

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what is the general rule of thumb when choosing a different helix? for example, my dad's 98 xtc 600 has a 47deg helix stock. let's say we would like to go to a mult-angle helix. Would the norm be to go 3 deg each way and then we would choose a 50-44?
 

I don't know what the norm is but 50/44 is what Turk recommends for that motor. 8ab or 8ca weights too.
 
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yeah that's what Turk told me too (50/44), but I just wanted to know how he choose that helix. he also, said the 8ca's because they are 2.5g heavier than the 8ab's and they have the same profile.
 
Yeah my friend has the 8ab's and he's probably gonna switch to the 8ca's. He's got the 8ab's maxxed out with 4.5 gram rivets in both holes right now. He says it's still over revving, but I don't see how.
 
he's over-revving? what rpm's is he turning? the 8ca's are suppose to be 2.5 grams heavier than the 8ab's. turk says use the 8ca's with 2.6g each hole. I like to use little 6mm bolts. that way I can just add a little washer or remove a washer and change the weight quickly and easier. I would still like my original question answered, before we get really off the subject of what this thread started out at. I'll help you and your buddy out, but lets also try to get my question answered as well.
 
I'm not sure what the RPM's are. He had 2.6's in both holes and told me it was overrevving by about 300, so I asked Turk about it and he said to put 3.1's in both holes, so I changed all the rivets and my friend claimed it didn't even change it, which is impossible I know. So then I put 4.5's in all holes for him. Well now he says it's better but still not right (he's trying to get it at 7800). I really don't know what the deal is with it. My friend isn't a complete moron or anything and has screwed with snowmobile clutching quite a bit so I don't know what to think. His mother just died on Saturday though, so his snowmobile is the last thing on his mind right now. Once we get more snow and he's doing better I'm sure we'll be screwing with it some more. I wasn't trying to hijack your thread or anything like that. Hopefully someone will answer your question.
 
oh no I understand. i never thought you were trying to hyjack my thread. My dad's sled ran at 8000 on the tach, which I would say is fine. the stock tachs i'm sure aren't calibrated, so I would run like 200 rpm over the 7800, so you know for sure you are at 7800. i know the ski-doo tachs read 150-200 rpm's higher than actual.
 
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