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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #21  
Old 2 Weeks Ago
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If you put in extra discs in the clutch the stack height may be too much to properly release.
You should have 8 steels and 8 frictions, start with a friction against the stud plate with spacers, end with a steel, then the thick 9th friction (one sided) disc last, under the retaining ring then the springs and release disc. DO NOT OVER TIGHTEN the nuts, I always use new nylocks.

I prefer the dual coil springs (stock) as they are wound opposite directions to counteract the rotation caused by compressing them.

Belleville springs might just work, might have to stack a couple to get enough motion and make an insert to space them and center them on the hub.
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  #22  
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"Belleville springs might just work, might have to stack a couple to get enough motion and make an insert to space them and center them on the hub". Once I get the loads measured I'll have to go through the catalogues and see what is available and then do some maths to get some with the right static loading. If I'm lucky it may be possible to get a light clutch pull too which would be nice. I have my own lathe so spacers shouldn't be a problem. The Evo uses a type of belleville washer and I was wondering if this could be adapted but looks to be a bit big.
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Why the hell would you replace a single or dual spring with SIX smaller ones? Seems like more trouble to me..
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Originally Posted by mikethebike61 View Post
Why the hell would you replace a single or dual spring with SIX smaller ones? Seems like more trouble to me..
not that it makes it equal by any means but you ever ride a dry clutch ironhead? its like having sex for the first time...

6 springs even the load WAY more that dual stock or single am.
the amf wet was cheaper to make thats why it was grafted. you see any other bikes with a setup like that? just the stud plate and retainer ring alone is a "how can we make this work opposite of normal" ordeal.
ill give its surely cheaper to manufacture but throw a few more cubic inches at it and ALL its downfalls come out.
get it tuned well and even worse.
my 3rd gear is literally cruse only. maybe 1/4 throttle before it lets loose. thats with the xr hub/drum mods.

to put it mildly ironhead wet clutches were a major downfall to these bikes.
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Originally Posted by mikethebike61 View Post
Why the hell would you replace a single or dual spring with SIX smaller ones? Seems like more trouble to me..
Do you know what a belleville washer is?

https://en.wikipedia.org/wiki/Belleville_washer
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Originally Posted by 8ball View Post
you see any other bikes with a setup like that? just the stud plate and retainer ring alone is a "how can we make this work opposite of normal" ordeal.
when I was at A.M.I they referred to that clutch as the reverse action clutch.
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Originally Posted by Serious Blac View Post
Do you know what a belleville washer is?

https://en.wikipedia.org/wiki/Belleville_washer
You mean like the 4 on my 560 SEC crankshaft bolt?
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Originally Posted by 8ball View Post
not that it makes it equal by any means but you ever ride a dry clutch ironhead? its like having sex for the first time...

6 springs even the load WAY more that dual stock or single am.
the amf wet was cheaper to make thats why it was grafted. you see any other bikes with a setup like that? just the stud plate and retainer ring alone is a "how can we make this work opposite of normal" ordeal.
ill give its surely cheaper to manufacture but throw a few more cubic inches at it and ALL its downfalls come out.
get it tuned well and even worse.
my 3rd gear is literally cruse only. maybe 1/4 throttle before it lets loose. thats with the xr hub/drum mods.

to put it mildly ironhead wet clutches were a major downfall to these bikes.
200+ hp BMW R1000RR, Yamaha R-1. GS- 1000, Kawasaki 1000 and every other (save for Ducati and they dumped the dry for wet in most street bikes)
go-to-hell-fast street bikes run wet clutches....I've had both and on the street I will take wet over dry anyday
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