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I have done as much research as I can, including going down to Motorcyclepedia in Newburg and closely inspecting 2 Knucks, an original paint '47 FL and a concours restoration '46. This is the issue. The bolt that secures the lower mount for the rear crashbar is 6036-37. Parts book says that same bolt used on both side. But on the right side, there is a unique spacer 6036-36C required so that the lower mount will not interfere with the rear muffler clamp mount. My bike is original paint and one owner and well documented. The problem was my spacer was missing and this is probably because a Panhead exhaust was installed at some point by the original owner. It rotted away and I've since installed a correct OEM replica exhaust. I can find no dimensions for the spacer except on a parts dimension list I found on the web that does not appear to be an HD publication. I machined a spacer based upon one that was shown to me by Dan Henke. Mine is 0.120 thick. The bike in Motorcyclepedia has a spacer that is the same thickness. That list I found said that the spacer is a 1/32" thick brash washer. I can find no other info on that spacer.
So, when my right lower bolt is assembled with the nut (all original parts that were on the bike) with my new spacer, the bolt threads are flush with the outside of the nut. The judges at the Yankee meet did not think that was right. Since the parts book says that the same bolt is used on both sides, unless you use a thinner nut or the lug on the frame is ground thinner, the bolt will not protrude from the nut the same as it does on the left side which does not use a spacer.
I measured the bolt on the restored bike at Motorcyclepedia and it measured 1-7/8". Everything I've been able to find about 6036-37C says it is a 1-3/4" bolt.
So, are there any original knucks out there from say 46 or 47 with rear crash bars and the original hardware on the right side, including the spacer. Would sure appreciate hearing what it looks like so I have data to use in my discussion with the judges next year.
Thanks.
Rob
So, when my right lower bolt is assembled with the nut (all original parts that were on the bike) with my new spacer, the bolt threads are flush with the outside of the nut. The judges at the Yankee meet did not think that was right. Since the parts book says that the same bolt is used on both sides, unless you use a thinner nut or the lug on the frame is ground thinner, the bolt will not protrude from the nut the same as it does on the left side which does not use a spacer.
I measured the bolt on the restored bike at Motorcyclepedia and it measured 1-7/8". Everything I've been able to find about 6036-37C says it is a 1-3/4" bolt.
So, are there any original knucks out there from say 46 or 47 with rear crash bars and the original hardware on the right side, including the spacer. Would sure appreciate hearing what it looks like so I have data to use in my discussion with the judges next year.
Thanks.
Rob