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Old 03-12-2014, 08:47 AM   #1
lookaught OP
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Joined: Jan 2010
Location: Casper, Wyoming
Oddometer: 198
Countershaft sprocket bolt dimensions? Anyone know the stock size?

The bike I bought had a used, bent, class 8.8 (which is the equivalent of a Grade 5...) bolt installed by a BMW dealer in place of the OEM counter shaft sprocket bolt.

I would like to order a replacement in my order with McMaster Carr, but am not sure of the proper dimensions and I'm not near my bike to measure. I seem to recall it's an M10 (or maybe M8), but I don't know the proper length or whether it should be flanged or not. The closest BMW dealer is 4 hours away, so I can't just pop over and order one.

So if anyone knows this info, sharing would be appreciated!

The bolt that came out...
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Old 03-12-2014, 09:37 AM   #2
sarathmenon
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IIRC, it's M8 for pre2010 and M10 post 2010. My 2012 has an M10 FWIW.
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Old 03-12-2014, 09:45 AM   #3
lookaught OP
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Dammit, I have a 2010 so I guess it could be either. I suppose I'll have to wait to measure the temporary replacement I put in when I get home.

Any idea if the oem is flanged or not? My bike had two washers, one was a centering washer the other was a spring washer. I'm guessing I could use either a flanged or non-flanged, but would like to order the appropriate one if someone knows.

Thanks for the input.
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Aprilia SXV 550 supermoto
F800GS 30th - sold and replaced by... a 2010 F800GS!
CRF450R
Solo Ride Pennsylvania to Anchorage, Alaska and back 2011

Two Ape supermotos take on the Dragon
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Old 03-12-2014, 10:01 AM   #4
itsatdm
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The stock bolt is not flanged, at least on the 2009 model, and the 2 washers are stock.
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Old 03-12-2014, 10:13 AM   #5
Reaver
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Location: Tronna area, Ontario Canada
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http://www.maxbmwmotorcycles.com/fic...5&rnd=04302013

Chapter 23, part 23. Pics, description.............SCREW - M10X35
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Old 03-12-2014, 10:42 AM   #6
lookaught OP
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Location: Casper, Wyoming
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Quote:
Originally Posted by Reaver View Post
http://www.maxbmwmotorcycles.com/fic...5&rnd=04302013

Chapter 23, part 23. Pics, description.............SCREW - M10X35
Oh wow, I didn't realize those parts diagrams are listed online.

Thank you very much!
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Aprilia SXV 550 supermoto
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Old 03-12-2014, 11:05 AM   #7
Reaver
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Both Max and A&S BMW have a parts fiche on their site. Max's seems better but sometimes A&S will have more info. I just cut and paste PN's for my email order at the local Dealer so parts boy doesn't get all frazzled and get me an airhead part.

That and when you forget what bolt goes where after an all nighter, you can get the dimensions online to sort it out.
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Old 03-13-2014, 04:01 PM   #8
FredRydr
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Location: Carlisle Pennsylvania USA
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Quote:
Originally Posted by Reaver View Post
I just cut and paste PN's for my email order at the local Dealer so parts boy doesn't get all frazzled and get me an airhead part.
LOL So true! However, if you ever get to Hermy's BMW along I-78, their BMW parts guy seems to have memorized half the bolts, and can recognize the other half if you show one to him!

Fred
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