K11 Owners Group

Frank T · Brick Rider Joined: 25 Jun 2007 Posts: 26

I bought a 1992 K75s about a year ago. It has 125k miles. I am getting ready to take a 600 mile weekend trip and decided to service the bike. During the valve check/adjustment number 2 exhaust valve measured .007 clearance. I removed the shim and it measured 2.00mm. Am I correct, this is the thinnest shim supplied by BMW? If yes, what are my options at this point? Is it cost effect to remove the head and do a valve job, if that is my only option? Will a gentle 600 mile trip cause any damage?
Thanks in advance for thoughts.
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Frank Tarpley
1992 K75s
1976 Hercules W2000
1968 Suzuki Cobra

Ted · Posted: Sun Apr 24, 2011 11:57 am Post subject:

Howdy Frank - was this measurement taken with the bike stone cold from having not been started since the day before?
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Ted

KOG#1

Frank T · Brick Rider Joined: 25 Jun 2007 Posts: 26

Yes the bike was cold, not started for a couple days. Actually number 3 cylinder exhaust valve also measured .007" but a 2.40mm shim corrected the adjustment to .010". The third exhaust valve was .010". The intakes were all .006".
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Frank Tarpley
1992 K75s
1976 Hercules W2000
1968 Suzuki Cobra

Phil Marvin · Posted: Mon Apr 25, 2011 7:55 pm Post subject:

Hi, Frank,
The K75 and K100 use 29mm shims. BMW shims are in .05mm increments from 2.00mm to 3.00mm. Some earlier Japanese bikes also use 29mm shims. I've heard some of them are available in .025mm increments. Maybe they are also available thinner than 2.00mm. Check an independent shop which works on older Japanese bikes. Good Luck!
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Ride Safe,
Phil Marvin in El Paso, TX
'94 K75A/3
'95 K75RTP

malcolmt · Posted: Tue Apr 26, 2011 6:55 am Post subject:

Is it feasable to take a shim and have it ground down to less then 2mm ?
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A Bike on the road is worth two
in the shed
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jarnbak · Posted: Tue Apr 26, 2011 6:50 pm Post subject:

It seems that you have a burned exh valve on no 2 or the valve seat has been re-worked.It is not normal to go all the way down to a 2.00 shim.
You can try a kawasaki or yamaha shop and see if they have a shim that fits.Do not use one from honda they are aprox. 0,5 mm larger in diameter.
Regards Palle.

Number 6 · Posted: Wed Apr 27, 2011 1:30 am Post subject: