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Old 05-15-2015, 05:01 PM   #1
GSJon OP
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Silencer bolt

I have some Jesse luggage racks on my F650GS and the bolt came out that goes through the rack the silence and into the frame. Does anybody know the length of this bolt that Jesse supplies? It looks like the stock one is an M8 x 50 but I do not know the length of the one that came with the rack and Jesse was closed today (Friday). I'm hoping Ace will have one.

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Jon
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Old 05-16-2015, 07:58 AM   #2
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My findings: Measured off bike: OEM bolt is 8mm X 50mm. The head is 13mm in diameter & 8mm thick (deep, high?). The OEM bracket on the muffler is 33mm thick.

Measured in situ so maybe not 100% accurate:

Jesse's bracket is 25mm thick minus 8mm for depth of the head = 17mm additional. So the bolt would be 70 to 75 mm which is about what I measured, noting that the bolt actually threads into the frame. Jesse's head has a 6mm allen key, 13mm in diameter. 70mm is my best estimate.

Good luck at an Ace for this long of a metric bolt. Buy several sizes if you get lucky: 65, 70, 75, 80.
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Old 05-16-2015, 08:21 AM   #3
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Thank you. I didn't even think of measuring the depth of the bracket and adding that to the original size. I'll let you know how it goes at Ace when I get up there later.
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Old 05-16-2015, 12:46 PM   #4
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Thanks Malloy, Ace had a M8 x 60 that seems to work. Not many threads go into the frame but I think it will hold it until I get something properly sized.

The M8 x 60 was the longest M8 that they had.
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Old 05-17-2015, 06:48 AM   #5
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Glad you found something to work, GS.

My best estimate sounds a little off. It would be interesting to know what Jesse uses. Maybe 65 to get more threads?

I would be a little bit nervous putting too much weight in the left side Jesse if the bolt is not fully threaded into the frame member.
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