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

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  #1  
Old 27th June 2022
NP72Iron NP72Iron is offline
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Default ‘72 Transmission questions

Hi all,
This is my first post, and I thank you in advance for your help.
I recently purchased a partial ‘72 Ironhead motor in a hard tail frame to slowly build up. I have lots of experience with working on cars and bikes, but have never assembled or disassembled a transmission. The motor came with the tranny already removed and apart with some parts missing. In looking through everything, I’m not sure what’s salvageable and what needs to be replaced. The main shaft has a few rough spots. It also came with two counter shafts which appear to be very slightly different (only one fits all the way into the countershaft bearing). The bearing has a couple of dents in it, but spins smoothly. The shift forks are worn, but I’m not sure if they’re bad enough to need to be replaced. The Clymer manual isn’t much help in this regard.
I’m attaching photos with the hope that someone wiser and more experienced can help me out. Thanks again!

-Rich













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  #2  
Old 27th June 2022
doodah man doodah man is offline
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Welcome to the forum! Check out this thread…
http://xlforum.net/forums/showthread.php?t=1734747
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  #3  
Old 27th June 2022
spacecoast spacecoast is offline
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You need a bible, a genuine service manual on your year scooter. The Clymer, Haynes, ain't fit to line a bird cage with.

Check out Doo's link as well as go to the stickies

http://xlforum.net/forums/showthread.php?t=465866

and read all the trans threads there. There is a wealth of knowledge stored here.
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Old 27th June 2022
NP72Iron NP72Iron is offline
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Thanks doodah and spacecoast!


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Old 27th June 2022
trappnman trappnman is offline
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I'll take the Clymers over the HD book any day of the week in rebuilding a transmission- info is the SAME and the pictures far better. Sweet lord.
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Old 27th June 2022
ryder rick ryder rick is offline
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Mainshaft is junk, pitted in roller contact area and stress riser gauling from blown up thrust washers. Get a Cheap eastern blowout on ebay.
A couple gears have the shift pockets rolled over pretty bad.
Forks look ok But are selective so you may not use both or either.
Replace the bearings.
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Old 27th June 2022
NP72Iron NP72Iron is offline
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Thanks for all replies so far, all!


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  #8  
Old 30th June 2022
NP72Iron NP72Iron is offline
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https://www.ebay.com/itm/16223934393...emis&media=SMS

Just picked this main shaft up on eBay and it is slightly different from what came with the engine. The two big things I see are that it’s slightly shorter and the threads aren’t as deep. Will this present a problem?


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