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

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  #41  
Old 16th October 2021
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I'm thinking even a heat blanket like a silicone heating pad or even an old electric blanket would speed up the chemical reactions between the penetrant and rust. Wrap it up and keep it toasty warm for a coupla weeks and try agina.
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  #42  
Old 16th October 2021
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Did a BSA that had been (reportedly) sitting in a hotel basement for 40 years last summer. Wound up drilling the tops of the pistons and slitting the piston skirts with a hack saw blade after all the usual concoctions were tried. Saved the barrels but the crank and rods were toast, the head had so much corrosion it had eroded the aluminum around the valve seats, also junk.
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  #43  
Old 16th October 2021
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This engine was in a basement for a long time. Does the OP know why it ended up in the basement in the first place?
So far from what the OP has mentioned, engine is stuck, has removed primary cover and attempted to turn the comp sprocket. That rotates. Has the cam cover been removed? Pri chain removed? Heads off?
No mention of rust except for interjections. He has mentioned trying PB ect, but why? Is rust oozing from ex, spark plug holes?? This very well be a mechanical lock up.
OP has mentioned the comp turns in both directions. The actual nut?? That is attached to sprocket shaft. If that is the case, and the crank is not rotating, there is a disconnect. Unless I missed something here, so far I see lots of speculation going on.
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  #44  
Old 17th October 2021
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Speculation simply because the OP isn't offering much in the way of information.

The engine sprocket in a compensator setup will turn a small amount even though the sprocket shaft isn't.

I have assumed rust as it's been sitting for 30 years in a basement.

Years ago my brother used to drag his into the basement to work on it over the winter. Dragging it out again was a whole 'nother nightmare. Narrow. steep stairs.

Had he left it in our basement for 30 years it would be junk. Barns are better.
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