100 grams+12000 rpm's+big boost=?

[Duke]

Yup.

My first thought was, you blew a tungsten and threw everything out of balance causing the clutch to grenade? I've seen the little screws that hold the weight in break before and spit out a tungsten.

Glad to hear nobody got hurt.

 

[summit-x]

holly piss batman

 

[M5-]

Have you looked into that new gear reduction set that allows you to run 12-13000 rpm and keep the clutch at 8500? Paul knows about it as I talked to him about it a while back. I forget who's making it, somebody in the east I think.

M5

 

[Duke]

Greg at GNS Enterprises makes the gear reduction kit.

http://www.powerbygns.com/Products.html

 

[zebiraross]

Ya I've seen that. I'm going to just go with a STM primary that can handle big boost and high rpm's while giving way better belt squeeze all the way through the rpm range.

 

[XTremist13]

not sure but am i missing something here......how are you guys pulling 12-13000 rpms out of that motor and not throwing a rod, arnt they rated for 10500 ? correct me if im wrong though please.

 

[MCX KILLER]

Pulled all 3 weights and pins off the sheeve. 100 grams of weight, 12000 rpms's and 20 psi. Guess I now know the limits of the stock primary. It may not look like it but this clutch only has 300 miles on it.

the stock primary has nothing to do on a turbo sled with power.maybe it can handle 320.

 

[zebiraross]

Xtremist13,
The engine had no problem spinning at that rpm, r1 bike engines redline at 13k. But the reason Yamaha set the rev limiter lower in the sleds I'm sure was because of the problems with the primary clutch not handling it very well like in my case. Plus one must have the ability to raise the rev limiter from stock.

 

[zebiraross]

the stock primary has nothing to do on a turbo sled with power.maybe it can handle 320.

I have no idea what your trying to say here.

 

[MCX KILLER]

I have no idea what your trying to say here.

the stock will make your engine rev to the rpm limiter all the time,and it will hurt the engine.No need to try to reed betwen the lines here zeb. its just a fact.you will altso get a better running sled when you get the STM. have anybody tryed STM secondary
http://supremetoolinc.com/cart/tuner-125-diameter-hd-secondary-p-113.html I think i will try it.

 

[zebiraross]

the stock will make your engine rev to the rpm limiter all the time,and it will hurt the engine.No need to try to reed betwen the lines here zeb. its just a fact.you will altso get a better running sled when you get the STM. have anybody tryed STM secondary
http://supremetoolinc.com/cart/tuner-125-diameter-hd-secondary-p-113.html I think i will try it.

I wasn't trying to read between the lines, I was just trying to understand what you were trying to say. I think I understand now.

 

[EZmoney]

What did Paul run on his sled last year for a clutch? i dont remember if it was stock or aftermarket.

 

[MCX KILLER]

What did Paul run on his sled last year for a clutch? i dont remember if it was stock or aftermarket.

Hi this is a werry good alternative, to hauch and stm 4 post clutch.This is altso way cheaper compared to the other optiones out there.
http://www.aaenperformance.com/snow_clutch.asp

 

[zebiraross]

What did Paul run on his sled last year for a clutch? i dont remember if it was stock or aftermarket.

He ran a stocker.

 

[XTremist13]

ic so is that what alot of guys are doing then, trying to find a clutch that will handle 13000 rpms ??? found anything ?

 

[Duke]

IMO a stock primary and a GOOD set of primary weights will handle all the hp I need in a mountain sled.

 

[BigFish BC]

yup get a set of dalton ajustable weights way better than the stms.

 

[zebiraross]

I liked my daltons, but even with dtya-3 loaded full with the super slugs I couldn't keep off the stock rev limiter when running over 20 psi. Lower boost levels they worked ok. I still liked the supertips better because I can run so much tip weight to help with belt sqeeze
on top end which extends belt life dramatically. I agree that the oem clutch is more then adequate for mountain riding.

 

[Duke]

I liked my daltons, but even with dtya-3 loaded full with the super slugs I couldn't keep off the stock rev limiter when running over 20 psi. Lower boost levels they worked ok. I still liked the supertips better because I can run so much tip weight to help with belt sqeeze
on top end which extends belt life dramatically. I agree that the oem clutch is more then adequate for mountain riding.

Back to the topic of the thread, I saw a STM 8 post clutch last year, it was a thing of beauty. I would say it would be the way to go if you are trying to spin that motor that fast. $1800 USD is a little pricey for a clutch IMO, not that anything else on these sleds is cheap. Especially if you take a weight in the face?

 

[zebiraross]

It sucks that they are so freaking expensive.