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

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Old 17th May 2010
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Shadowdog500 Shadowdog500 is offline
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Sportster/Buell Model: XLH-1000
Sportster/Buell Year: 1975
Other Motorcycle Model: Honda Spree
Other Motorcycle Year: 1987
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Originally Posted by Ferrous Head View Post
By locating top dead centre and then rotating the engine backwards until the center portion has dropped 11/16ths your IH engine is now at 45 BTDC.
Not sure if I would trust this to measure exactly how far the piston went down on an ironhead. The spark plug goes in on an angle and is not going straight down into the top of the piston so the angle would give you a false reading. I bet the spark plug was on the top of the head on your race bikes.

Chris

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