My '83 R65 Front 'clunk' over potholes. Driving me CRAZY - Page 3

Cogswell · 03-30-2010, 10:20 AM

Ok, I have my forks apart to do this update/mod just in time to hurry up for the spring rally a few weeks away. The clunking has been quite annoying on full extension.
I have gone over this thread for my part numbers, (Thanks Phack) and the one thing I cant seem to find is the large O-ring that fits in the bottom of the fork leg to seal the lower cap. Anyone have any ideas where I may find this culprit on the fiche ?

TIA

Mike

mark1305 · 03-30-2010, 11:24 AM

Since this thread fell into obscurity, I'm pretty sure I've traced my particular clunk to the dash mount bracket flexing on sharp bumps. I can hold it with one hand and pull against it and silence the clunk over bumps that normally cause it.

Now what is actually clunking under the plastic trim remains to be discovered. I can't find anything loose in there.

Cogswell · 03-30-2010, 01:01 PM

Quote:

Originally Posted by mark1305

Since this thread fell into obscurity, I'm pretty sure I've traced my particular clunk to the dash mount bracket flexing on sharp bumps. I can hold it with one hand and pull against it and silence the clunk over bumps that normally cause it.

Now what is actually clunking under the plastic trim remains to be discovered. I can't find anything loose in there.

Mark do you mean the mount for the instruments on the rubber bushings ?

Other than that I'm stuck. Went to the local dealer and he tells me that
part #31-42-2-301-885 is no longer available from BMW, so I may not be able to do the update unless I find a dealer with the parts covered in dust on the shelf.

Mike

mark1305 · 03-30-2010, 06:28 PM

Mike, when I run that part number through the Max BMW fiche, its available for under $3 (remove the dashes to search part numbers). And its listed for a whole bunch of bikes. Valve housing down in the shock absorber part of the forks, correct?
http://www.maxbmwmotorcycles.com/fic...31422301885%20

In my case, yeah, the clunk is either the plastic fairing around the instruments or the instruments flexing the stamped sheet metal "Panel" that holds tach, speedo, and headlight. The headlight is held pretty rigidly, so I suspect a combo of instruments and plastic fairing bouncing and hitting over bumps.

boxerboy81 · 03-30-2010, 07:54 PM

Try checking the wear on the large centre nut at the upper yoke.

These can wear over the years. Remove it, and replace with a shim made from an alu drink can, applied over the forward facing surface. Does Grolsch come in a can?

It's an easy test, and cheap to try. Might get lucky.

Cogswell · 03-31-2010, 05:44 AM

Quote:

Originally Posted by mark1305

Mike, when I run that part number through the Max BMW fiche, its available for under $3 (remove the dashes to search part numbers). And its listed for a whole bunch of bikes. Valve housing down in the shock absorber part of the forks, correct?
http://www.maxbmwmotorcycles.com/fic...31422301885%20

In my case, yeah, the clunk is either the plastic fairing around the instruments or the instruments flexing the stamped sheet metal "Panel" that holds tach, speedo, and headlight. The headlight is held pretty rigidly, so I suspect a combo of instruments and plastic fairing bouncing and hitting over bumps.

Mark, I had the local dealer run it on "lightspeed" I think part locator and it showed NLA in the US and the Fatherland, he called BMW parts help in Jersey too.
I spoke with Craig at Benchmark works yesterday afternoon and he said his parts source in europe shows it available. I will know in 3-4 weeks if it shows up. I may call a few others in the meantime in the event some are laying on the shelf somewhere.
Hey I've got 3 weeks till the rally right, plenty of time.

Mike

Cogswell · 03-31-2010, 05:44 AM

Quote:

Originally Posted by boxerboy81

Try checking the wear on the large centre nut at the upper yoke.

These can wear over the years. Remove it, and replace with a shim made from an alu drink can, applied over the forward facing surface. Does Grolsch come in a can?

It's an easy test, and cheap to try. Might get lucky.

Thanks, I'll check the clearance at the large center nut too.

Mike

spo123 · 03-31-2010, 03:17 PM

Rusty, at Max BMW in NH, is absolutely THE BEST PARTSMAN ANYWHERE!
spo

Cogswell · 03-31-2010, 05:25 PM

Quote:

Originally Posted by spo123

Rusty, at Max BMW in NH, is absolutely THE BEST PARTSMAN ANYWHERE!
spo

I called and spoke with Rose yesterday, Rusty won't be back from vacation till tomorrow.

Mike

rustygardhouse · 10-23-2012, 09:16 PM

So...

How did this end?

Smiles or tears?

Did you find a source of 31 42 2 301 885 VALVE HOUSING?

Got the same problem on my '80 R65 & looking for a fix.

03-30-2010, 11:24 AM	#32
mark1305 Old Enough To Know Better Joined: Feb 2005 Location: Merritt Island, FL Oddometer: 5,516	Since this thread fell into obscurity, I'm pretty sure I've traced my particular clunk to the dash mount bracket flexing on sharp bumps. I can hold it with one hand and pull against it and silence the clunk over bumps that normally cause it. Now what is actually clunking under the plastic trim remains to be discovered. I can't find anything loose in there. __________________ Mark J Merritt Island, FL When a person asks you for advice, they don't want advice. They want corroboration.

03-30-2010, 06:28 PM	#34
mark1305 Old Enough To Know Better Joined: Feb 2005 Location: Merritt Island, FL Oddometer: 5,516	Mike, when I run that part number through the Max BMW fiche, its available for under $3 (remove the dashes to search part numbers). And its listed for a whole bunch of bikes. Valve housing down in the shock absorber part of the forks, correct? http://www.maxbmwmotorcycles.com/fic...31422301885%20 In my case, yeah, the clunk is either the plastic fairing around the instruments or the instruments flexing the stamped sheet metal "Panel" that holds tach, speedo, and headlight. The headlight is held pretty rigidly, so I suspect a combo of instruments and plastic fairing bouncing and hitting over bumps. __________________ Mark J Merritt Island, FL When a person asks you for advice, they don't want advice. They want corroboration.

03-30-2010, 07:54 PM	#35
boxerboy81 Stay Horizontal Joined: Jul 2009 Location: Oz, Australia Oddometer: 1,600	Try checking the wear on the large centre nut at the upper yoke. These can wear over the years. Remove it, and replace with a shim made from an alu drink can, applied over the forward facing surface. Does Grolsch come in a can? It's an easy test, and cheap to try. Might get lucky. __________________ R100RS Gallery, over 800 pictures...

10-23-2012, 09:16 PM	#40
rustygardhouse rusty Joined: Jun 2012 Oddometer: 24	So... How did this end? Smiles or tears? Did you find a source of 31 42 2 301 885 VALVE HOUSING? Got the same problem on my '80 R65 & looking for a fix. rustygardhouse screwed with this post 10-23-2012 at 11:29 PM

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03-30-2010, 10:20 AM	#31
Cogswell Spudly Adventurer Joined: Jan 2005 Location: Riding with my pal Richard Cranium Oddometer: 3,253	Back from the depths..... Ok, I have my forks apart to do this update/mod just in time to hurry up for the spring rally a few weeks away. The clunking has been quite annoying on full extension. I have gone over this thread for my part numbers, (Thanks Phack) and the one thing I cant seem to find is the large O-ring that fits in the bottom of the fork leg to seal the lower cap. Anyone have any ideas where I may find this culprit on the fiche ? TIA Mike __________________ Cogswell Rides To Big Bend See my airhead project here Time Warp Vintage Motorcycle Club The good thing is, your damn motor can't read. If it says oil on the container, it's pretty much OK to dump in there.... ED.

03-31-2010, 03:17 PM	#38
spo123 Gnarly Adventurer Joined: Nov 2006 Location: North Shore Mass. USA Oddometer: 453	Rusty, at Max BMW in NH, is absolutely THE BEST PARTSMAN ANYWHERE! spo