pete72
New member
so im in the market for a better clutch and understand the Polaris p85 is a good choice and better then these comet 108's. from what i have read the crank size on the exciter is 30mm with a 1:10 taper. how does one know what to look for when looking for a used one? i know Polaris has at least 2 different bore sizes and have read there are also different bore depths and offsets for the face of the sheaves. is there a particular year and model of Polaris sled to look for as fitting. just way too confusing really. hopefully someone on here will know or maybe even have a setup. maybe im way off base too and there is something better for a primary in the Yamaha flavor? BTW need something that uses the wider 1 3/8 belt.
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Throttle Junkie35
New member
I believe you would need the deep bore Pol clutch if going that route. If you notice, the 108 you have now barely clears the side panel. You could use all your current tuning parts if you were to purchase a P-85. The Yami YXR primary is a good choice too. This is what im running at the moment and I have a set up that works really well. It would probably work in your psi sled nice too.
pete72
New member
what yami uses the yxr throttlejunkie35? how would i know which is a deep bore p85? most sellers don't know what they have that are selling. just don't want to buy then not be correct. im all ears with your set up. i should have my 88r tomorrow:>) so makes sense to boot the comet now too
1. For example:
* Exciter-II ( 1991-1993 )
* Phazer-II ( 1992-1998 )
* Venture 480 ( 1992-1998 )
2. Rule of thumb...
All P85 that has been on a 2-cylinder water cooled FUJI Engine from 1987---> will fit on your Exciter
and also from the 4-stroke FST and FS models.
Example:
* Indy-400
* Indy-440
* Indy-500
* Wide Track
pete72
New member
thanks for the info lasse. very very helpful for my quest. should be easy enough to round something up. p85 is what i will go with. like throttlejunkie35 said i will be able to use my weights and springs as an added bonus. :>)
I have a rebuilt yxr from a 93 exciter with arms and spring that will bolt right on.
pete72
New member
please pm me with more info & price
pete72
New member
well i found a p85 that looks to be in good shape and its local. after buying a newer 88r secondary and shimming my comet 108exp for the proper belt width im not sure if i should pull the trigger and buy it. my comet 108 was wicked noisy because the cam weights were just flopping around. there tight now against the rollers but there is still a bit of noise. i suspect the wear pucks are a bit worn. pins and rollers look and feel good. i know the 108's are spendy to rebuild so what about the p85's? are they just a better all around clutch? back in the day my dad bought a brand new 1972 Polaris colt 295 and always said they were ahead of there time clutch wise. any thoughts guys?
Throttle Junkie35
New member
The polaris clutches are definitely stronger than any comet. The Exp isnt a bad clutch clutch though. I would make sure the clutch you are buying is in darn near mint condition or you will be in the same situation you have with your 108. You could probably rebuild your 108 for around $160 and have basically a brand new clutch. It might be the way to go as long as your 108 doesnt have a rusted shaft and the rest of the core is in decent shape. Its up to you. I understand we all have a budget and want the biggest bang for the buck, but sometimes being penny wise and a dollar foolish ends up costing you a lot more in the long run including piece of mind.Espescially on something that is spinning at 8,000 RPM. This is where you dont want to find out the good deal you got maybe wasnt such a good deal after all. LOL.
Backwoods M Max
New member
Isn't that the truth. I'm trying to get my sled clutched out and working right. I should have heeded sound advice and bought heel clickers from the start instead of buying a pile of springs and a helix that will never work. Now I have a pile of clutch springs, a helix and weights/rivets I probably won't ever use.