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

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  #11  
Old 1 Week Ago
needspeed needspeed is offline
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I don't have an answer for you on this problem, but for what it's worth I can tell of some observations from what I have.

I have a '77 crankcase with the torrington AJ48045 bearing. A shaft with the pressed on inner race measures 1.249". When in the bearing there is some shake at the end of the shaft as expected but it does not appear to be as much as what you have and I can't begin to insert a feeler gage in there like you can.

Also, I have a precision ground pin that measures 1.250. It doesn't slide easily into the bearing but when in it rotates freely.

An old S+S cycle catalog shows they offered pinion shafts for '81 to '85 in standard and .001 and .002 oversizes. They don't say what the standard size is but the oversize shaft would require the use of a bearing from an '87. Apparently in 1987 harley started using bearings of slightly different sizes and were color coded.

blue 24647-87
red 24650-87
white/gray 24659-87
green 24660-87

I don't know what the size differences are or why they are needed.
In my opinion you should be able to buy a bearing and shaft and have the fit be within tolerance.

Like you did. And no, you're not stupid.
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  #12  
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Quote:
Originally Posted by Rolli View Post

Will the 24008-75, shaft with sleeve fit my 83 wheels ?
I think no. Please teach me.
no. toejam covered that in post#7 non-commonized vs commonized.
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  #13  
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Well you can always get an S&S shaft like I did when my HD one broke.



I found my bearing support loose and had to get another case half which turned into a nightmare because the case halves for the commonized shaft are matched and can not be lapped in like early cases.
I found a right side that was within .002 run-out with the left case half then honed it to 0 so I used an S&S shaft with .001 larger dia.

Also S&S guaranteed me it wouldn't break again .. something about it being a super metal which flexes instead of breaking.
I also have the S&S super shaft on the clutch side now after another incident .
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One of the reasons a lot of "dealerships" Quit working on Ironheads was the fact that HD went to a color-code system on bearings, back in the early '70's. When they went to the EVO motor they slowly fazed it out, so finding the matching shaft/bearing/race setup takes a lot of math and how heat/warmup affects bearing tolerances. '81-'85 the specs were a lot "Looser" than the previous years. I'm not really sure why, I've read where they figured new owner's just don't take the time to break them in properly, therefore a looser fit meant a longer lasting engine. I, personally think the quality of the metals they used had a lot to do with it, too.
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... ending up with rattling engines.
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