OEM vs SS Steel Clutch Springs

[He Man]

"how old do you think she is"

"'I knew that girl was 18. She told me her last boyfriend was Asian, and that crap doesn't start until college.'"

[corndog67]

I've dealt with Chris from Barnett over the years for different bikes/applications, and he has always been very straightforward, never bullshitted me, and has always been helpful.   Plus the fact that Barnett has been making clutch parts for as long as I can remember, I'd tend to believe him. 

If I can get some time, I'll talk to one of our engineers at work about the difference in spring materials, Stainless vs. Alloy steel.   If I recall correctly, and I might be wrong, but I seem to remember something about stainless sacking out earlier than spring steel, but that might have been years ago. 

And taking 2 springs out of a clutch that is designed for 6?   Maybe it's time to go to the gym, or buy something with less power and doesn't need a strong clutch. 

[DrDesmo]

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[He Man]

never got a response from him. I dont think he wants to talk to me anymore.

[Triple J]

Did he ever explain how the lower spring pressure would lead to premature failure of their plates?

[DucHead]

Did he ever explain how the lower spring pressure would lead to premature failure of their plates?

Less pressure on the plates = more slippage = more heat = faster deterioration of friction material?

[He Man]

Less pressure on the plates = more slippage = more heat = faster deterioration of friction material?

he didnt explain it, but thats the reason why. ^^, longevity of a clutch is based on how often is slips. the less slipping, the longer lasting, however, the point at which it does slip is whats under debate here.

I dont really understand how he tested it though. he said he took a 1 inch spring and compressed it. it took the speedy moto spring 4 less pounds to compress to the same amount?

Speedy moto says that with a 95lb test, OEM springs vary up to +/- 10% that means its up to 9.5lbs of deviation thats acceptable for OEM plates. +/-4 lbs is half that. So while Barnett could be right, the significance of it is completely off to me. Your saying that speedymoto springs cause accelerated wear. Your basically syaing thier product sucks in a nice way, so i dont get why he got all pissy.

[Triple J]

Less pressure on the plates = more slippage = more heat = faster deterioration of friction material?

That's what I'd think...but I'd expect He Man would have noticed his brand new clutch slipping if this was the cause. Also, how come my (and many others) stock clutch works just fine for the past 13K miles with the Speedymoto springs?  

[He Man]

That's what I'd think...but I'd expect He Man would have noticed his brand new clutch slipping if this was the cause. Also, how come my (and many others) stock clutch works just fine for the past 13K miles with the Speedymoto springs?  

clutch was defnitely not slipping, it caught so well, it took about 500 miles to break in. I kept stalling cause it caught so early.

and to answer your later question, is why i think barnett is full of stinky poo when they said that.

[Langanobob]

clutch was defnitely not slipping, it caught so well, it took about 500 miles to break in. I kept stalling cause it caught so early.

This plot is thickening    According to my fairly simple understanding of how things wear out, two or more surfaces have to be rubbing or slipping together.  So, how did the plates wear out if they were not  rubbing or slipping?  I think JJJ already asked this question or close to it.

Can you post pics of  your failed plates?

[He Man]

I will probably next week. they are still in the bike.

i can still do 70mph! thats plenty fast enough to get to school and back...school ends tuesday and i got a set of OEM Duc Plates ready for install. I guess ill post up a video tutorial while im at it so no one has a good excuse for accidently summoning zombies.

[Popeye the Sailor]

If I can get some time, I'll talk to one of our engineers at work about the difference in spring materials, Stainless vs. Alloy steel.   If I recall correctly, and I might be wrong, but I seem to remember something about stainless sacking out earlier than spring steel, but that might have been years ago. 

There is a reason spring steel is used in springs 

[He Man]

There is a reason spring steel is used in springs 

why? 

[corndog67]

I spoke to one of the design guys at work and he told me that it used to be that stainless wire would fatigue earlier than regular spring steel, not sure of what the details are about stainless alloys these days.    So, that is still no answer.   I'll keep checking. 

[hypurone]