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Sportster Motorcycle Transmission, Clutch, Primary & Secondary Drive Transmission, Clutch and primary or secondary drive problems, advice, and/or how tos.

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  #1  
Old 18th December 2020
JonesL JonesL is offline
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Default Clutch spring question

Hello and Merry Christmas to all,

While we're staying home I decided to do some clutch work on the '71 ironhead.
When I took it apart, I found that the inner and outer clutch springs were two different heights. Figuring one was collapsed, I ordered a new set and sure enough, both are the same height. Figuring I was right, I put everything back together including new steels and stock discs and aside from the clutch being a little stiffer, life is good.

Looking around to see what else is new ironhead clutch-wise, I've run across other listings for new clutch spring sets and some show two different height springs.
So what gives? Are there in fact two spring sets and if so, why the difference?
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  #2  
Old 18th January 2021
DDDDylan DDDDylan is offline
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Sportster/Buell Model: XLS 1000
Sportster/Buell Year: 1979
Other Motorcycle Model: CB750
Other Motorcycle Year: 1995
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Default

Quote:
Originally Posted by JonesL View Post
Hello and Merry Christmas to all,

While we're staying home I decided to do some clutch work on the '71 ironhead.
When I took it apart, I found that the inner and outer clutch springs were two different heights. Figuring one was collapsed, I ordered a new set and sure enough, both are the same height. Figuring I was right, I put everything back together including new steels and stock discs and aside from the clutch being a little stiffer, life is good.

Looking around to see what else is new ironhead clutch-wise, I've run across other listings for new clutch spring sets and some show two different height springs.
So what gives? Are there in fact two spring sets and if so, why the difference?
From the parts book it looks like your 1971 should have the same clutch spring part numbers as my 1979. 38080-71 inner and 38079-72 outer. The 79-85 service book gives the same guidelines for both springs:
New free length = 2.390"
Service limit free length = 2.344"

However, I have two sets of used OE clutch springs here and the inners are shorter than the outers.
Inners = 2.313-2.344
Outers = ~2.625
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  #3  
Old 18th January 2021
DDDDylan DDDDylan is offline
Chief Harley Engineer
 
Join Date: Nov 2012
Posts: 522
Sportster/Buell Model: XLS 1000
Sportster/Buell Year: 1979
Other Motorcycle Model: CB750
Other Motorcycle Year: 1995
Reputation: 26044
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Default

I just realized this is in a transmission section of the forum. You might want to ask a moderator to move it into the Ironhead section and you'll get more replies.
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  #4  
Old 19th January 2021
JonesL JonesL is offline
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I appreciate the information, DDD. I went with two new springs, both with the same free length dimension. Clutch is stiffer now but more positive.
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