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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  
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Mine was cracked too but I had to split the case anyway.

I bought a Pingel. I *think* you can cut the cracked one off with a Dremel.

I occasionally do aluminum sand casting. I have a half a mind to copy a few Pingels.
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  #42  
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Mine was cracked too but I had to split the case anyway.

I bought a Pingel. I *think* you can cut the cracked one off with a Dremel.

I occasionally do aluminum sand casting. I have a half a mind to copy a few Pingels.
Interesting. I've held off buying a new mount since I won't be pulling the motor yet. The Pingels are fairly expensive, and I can get a NOS mount for about 55 bucks. If you do make some, I'd be interested.
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  #43  
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make one from steel or aircraft aluminum.
it is a science with casting aluminum due to all the components that must be mixed in, that plus add in impurities and out gassing which creates voids, just look at the hd stuff!
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My motor mount situation keeps getting better and better. I went for a short ride to diagnose some of the noises, rattles, etc. that the bike makes. There is a fairly loud rattle coming from the front of the frame under the tank. Upon investigation, the front upper mount is bolted to the rocker cover, but the bolt that goes into the frame is missing.
When I got my 72 the top mount parts were all mixed up. A quick look at the manual and it's put back together properly. It's just washers and spacers but dang they have to go together right. I don't blame the PO for mixing them all to hell and winding up with a cracked rear mount.
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make one from steel or aircraft aluminum.
it is a science with casting aluminum due to all the components that must be mixed in, that plus add in impurities and out gassing which creates voids, just look at the hd stuff!
True. Guy across the street had a Countach in for servicing. Oil all over the inside of the hood. Looked everywhere. Couldn't find the oil leak. Turns out there was a pinhole in the cast Al valve cover. Customer insisted on a new valve cover. I don't even know if Glyptal had been invented yet back then.

I have a spare 73 case. Porosity city. Stealer wanted more money to give the 6 x 8 section a coat of Glyptal (it's already been blasted and cleaned) than a can of Glyptal costs.

When I cast I use recycled lawnmower crankcases and always degas. Can't say I ever cut anything open though to see if I have any bubbles though.
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