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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 4 Weeks Ago
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Now that you are measuring which position is your trap door bearing in?

If you set the mainshaft end play to .009 what happens when you pull the clutch lever?

If that .009 goes to .000 you will turn some parts blue.

The trap door bearing needs to take the thrust force, NOT the endplay shims.
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  #22  
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Originally Posted by ryder rick View Post
Now that you are measuring which position is your trap door bearing in?
I attached a pic in post #10 showing the bearing being pushed toward the inner retaining ring while measuring end clearance. I was told that was how the clutch would press against the bearing while in actual use...

If that is true (for my 1983 XLH w/wet clutch) then my m/s clearance would be .009" minimum...

Yes??? No???

Edit: I noticed that when I let the pressure off the bearing that the end play went to .015"...
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  #23  
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Yep, that is the way to do it.

The end play will get huge if the bearing moves outwards much, many will.
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Now, is it worthwhile to juggle c/s thrust washers around and try to get .009" or even .008"???
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  #25  
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No I would actually favor the loose side as you are putting a preload on the bearing.
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Originally Posted by ryder rick View Post
No I would actually favor the loose side as you are putting a preload on the bearing.
Well, then I guess that except for taking everything in the trans apart and pouring 50wt on the parts and re-assembling, I'm done with the trans.

...And still have six months before I can ride again...
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  #27  
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6 months?? Sounds like you could easily eat that up stressing about your front wheel bearing end play. What do you have that at? I believe spec is .004”-.018”. Where are you at now? .004 or .018”??? Should you go 4, 18, 7???? Decisions, decisions.....
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Originally Posted by Iron Mike View Post
...front wheel bearing end play. What do you have that at?
Edit: My PO changed to the cast wheels. He liked the look of the XLX.



FSM doesn't seem to give instructions for the cast wheel Timken bearings.

What other IH quirks do you have to torment me with???

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  #29  
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What other IH quirks do you have to torment me with??? [/QUOTE]

Small steps, you did say you only have 6 months...
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While a cast wheel will have different expansion rates the specs are the same.
And to me .018" is stupid loose.

But then the manual says to tighten the axle nut after setting the end play....
So they were smoking some high grade.
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