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

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  #11  
Old 1 Week Ago
bill smith bill smith is offline
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JD's are pretty cool, most folks don't realize there was something besides Knucks. The things we take for granted like lapping main bearings and boring cylinders were done quite differently in the teens and twentys. Setting the timing is quite the chore.
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  #12  
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Iron Mike Iron Mike is offline
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Quote:
Originally Posted by bill smith View Post
JD's are pretty cool, most folks don't realize there was something besides Knucks. The things we take for granted like lapping main bearings and boring cylinders were done quite differently in the teens and twentys. Setting the timing is quite the chore.
I had the treat of watching 15 or so running full song around the Del Mar mile in the early 2000’s. Quite impressive on the speeds those overgrown bicycles were achieving.
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  #13  
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JonesL JonesL is offline
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My experience with graphite/oil or grease mixes is as an anti-seize compound on threads subject to high temps like exhaust manifold bolts and nuts, and as a sealer in conjunction with copper sealing rings on steam locomotive boilers. The anti-seize properties let the copper rings creep a little as the steam dome nuts are being tightened down. Some of our boilers are 200 psi working pressure At those pressures the temps to get water to boil can get close to 400 degrees. The JDs don't see those temps or pressures but to be honest, we still rely on the copper or machined surfaces to do most of the sealing.

Iron Mike and bill; you're right. Everybody gets excited over "Eight-valve", Oval Port" motors but a good running pocket valve is my favorite.
My friend still had the one he bought new and still took it out to ride occasionally. He had a brown shoe string tied to each exposed intake push rod and I finally decided to show my ignorance by asking why they were there and what were they for. Once he explained, it was the simplest reason I ever heard. 'Aww', he said 'that's so if I ever over-rev it and it spits out a push rod, I don't have to walk two blocks back looking for the darned thing'.
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Last edited by JonesL; 1 Week Ago at 04:38.. Reason: typo
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  #14  
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bill smith bill smith is offline
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Haha heard stories about pushrods flyin out before. I guess once the revs get up vacuum takes over because they will still haul ass
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Quote:
Originally Posted by Iron Mike View Post


Can’t help much more on the graphite, but was at the Milw factory museum last Tuesday and took this pic.
silent gray fellow?
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  #16  
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Iron Mike Iron Mike is offline
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Not quite, I think SGF was ‘07?? Quite a few development changes in the early years, yr to yr.

A few other pics for your viewing pleasure. (For those who haven’t made it to Milw.)





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