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Members Birthdays
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18th December 2020
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XL FORUM TEAM MEMBER
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Join Date: Dec 2013
Posts: 674 Sportster/Buell Model: XL Sportster/Buell Year: 1971
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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?
__________________
Never be afraid to try something new.
Remember, amateurs built the ark and professionals built the Titanic.
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18th January 2021
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Chief Harley Engineer
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Join Date: Nov 2012
Posts: 522 Sportster/Buell Model: XLS 1000 Sportster/Buell Year: 1979 Other Motorcycle Model: CB750 Other Motorcycle Year: 1995
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Quote:
Originally Posted by JonesL
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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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
__________________
1979 XLS, '76 Keihin butterfly carb, Ultima ignition, Andrews C ratio gears
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18th January 2021
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Chief Harley Engineer
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Join Date: Nov 2012
Posts: 522 Sportster/Buell Model: XLS 1000 Sportster/Buell Year: 1979 Other Motorcycle Model: CB750 Other Motorcycle Year: 1995
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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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19th January 2021
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XL FORUM TEAM MEMBER
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Join Date: Dec 2013
Posts: 674 Sportster/Buell Model: XL Sportster/Buell Year: 1971
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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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