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

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  #51  
Old 19th November 2022
Hopper Hopper is offline
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Sportster/Buell Model: XLCH 1000
Sportster/Buell Year: 1977
Sportster/Buell Model #2: 75 motor in Norton frame.
Other Motorcycle Model: 42WLA 45, Harton, Narley
Other Motorcycle Year: 1942
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Quote:
Originally Posted by XLXLXL View Post
hmmm how do we measure this for sure? what is the specification we are talking about?
It's in the factory service manual. Somewhere about 2 to 4 thou clearance. Measured with a ball gauge and micrometer usually, or by rocking the stem in the guide and measuring movement with a dial indicator.
Carefull inspection of the valve stems should show any evidence they have been hanging up. Will be all scuffed up or galled.
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  #52  
Old 20th November 2022
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Steve9 Steve9 is offline
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I would use a gage pin. Tells you the largest diameter that will pass through the guide, concentricity etc.

The other methods are valid also
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'81 Andrews "Y" cams, K. Black 9-1 pistons
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  #53  
Old 30th November 2022
XLXLXL XLXLXL is offline
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Sportster/Buell Model: XLCH 1000
Sportster/Buell Year: 1973
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I found the problem. we didn't think about it before, and I thought it would never happen, but it did. Sh*t happens!

The cam gear #2 woodruff key was broken, and the gear rotated in different directions. I have re-open the cam gear cover hundreds of times (hyperbolic) and finally realized this is what happened.

here is the pic

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