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Old 07-08-2014, 03:04 PM   #1
V4Moto OP
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Billet top clamp/yoke for R80GS

Anyone know of someone that makes these for the GS's 40mm forks? Just had my triple tree top clamp or top yoke (I see it called different names in different parts of the world) cracked off where the bolt goes so I'm grounded for a bit and would prefer to replace it with a billet top clamp if possible to avoid same thing happening.

Tried SJ BMW and the few resources that came up from some searching but they only make em for the G/S.
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Old 07-08-2014, 03:27 PM   #2
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Yes, HPMGuy in this form, sells (sold?) one in the Vendor area

http://www.advrider.com/forums/showt...ghlight=hpmguy
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Old 07-08-2014, 03:29 PM   #3
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I suspect the reasons it's not a popular aftermarket part is that 1) it's already a strong aluminum casting, and 2) each version of the top clamp (there are two) was only in use for a few years.

There was a guy here not long ago making some clamps himself, and he was making a few extras. Not sure if they were what you need, though.
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Old 07-08-2014, 08:09 PM   #4
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Thanks SL & Anton. I have a feeling one of Guys units will work for me, I'll call him tomorrow. Fingeres Xd I'll be back on the road again soon.

Anton, I looked carefully at mine and it fractured right at the point that the top clamp clouted the tank on a previous drop, they line up. I guess mine was weakened by that impact and just let go when I was retorquing it. Glad it did it at the house and not out on a back country trail.
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Old 07-09-2014, 05:13 PM   #5
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Oops there goes another one

HPMGuy hopes to make some more billet ones later this year but I managed to beg a spare original from another owner to let me get on my trip. It went on just fine until i tightened the upper clamp bolts. Snapped another upper clamp !!

Clymer gives the Torque spec as 29-33ft-lb so I set my wrench at 22 one side went good, the second side snapped the casting.

wondering if anyone who is using one of HPMGuy's billet clamps from the 2008 run would have an original to sell so that I can tried the 3rd time lucky theory. Otherwise I am sitting this short riding season out this year until HPMGuy is able to make another batch.
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Old 07-09-2014, 07:03 PM   #6
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Both top clamps cracked at the same place, first one on the right fork, second time on the left fork

http://s46.photobucket.com/user/V4Mo...g.html?filters

Is the Torque value correct in the Clymer? I used Snowbums torque values for all other parts but couldnt find one for the top clamp so went with a very conservative take on the Clymer value
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Old 07-09-2014, 07:04 PM   #7
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picture link may not work - try this one

http://s46.photobucket.com/user/V4Mo...pyoke.jpg.html
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Old 07-10-2014, 03:29 AM   #8
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M8 pinch bolts are generally around 20 N-m. You were over 30.

What issue of the Clymer, and what page, were you reading that says 29~33 ft-kb? That sounds like a number for an M10 clamp bolt.
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Old 07-10-2014, 06:53 AM   #9
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Looks like a 3rd edn of R50/5 through R100GS PD 1970-1996. Its on page 523 chapter 9
" Fork bridge upper clamping bolts " Nm 40-45, ft-lb 29-33

Lower bridge clamping bolts are below and they are slighly lower

Do you think these are incorrect? It certainly would explain why the 2 clamps let go like that
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