Fallen victim to the cam chain - K-Bikes.com - Excellence in Motion
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post #1 of 80 (permalink) Old May 8th, 2011, 6:20 pm Thread Starter
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Fallen victim to the cam chain

Well, before I even had a chance to install the new one, the old one jumped up and bit me. The bike has been sitting for a while due to one thing or another in my life right now, so I went to start it and go for a ride. Man, that thing rattled bad I thought, so I shut it off and restarted. Still noisy. Tried for a 3rd time and it was NOT the charm. She won't crank and acts like something is locked up in there. Crap, crap, and double crap!!

Guess I'll find out how good my extended warranty is.........

Now I need to find a trailer to get it up to Lone Star.

Doug Turner
'86 Concours
'99 K1200LT - gone
'06 K1200GT - the new kid in town
'08 Wing - gone
Marshall, TX
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post #2 of 80 (permalink) Old May 8th, 2011, 6:32 pm
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Quote:
Originally Posted by dwsdad
Well, before I even had a chance to install the new one, the old one jumped up and bit me. The bike has been sitting for a while due to one thing or another in my life right now, so I went to start it and go for a ride. Man, that thing rattled bad I thought, so I shut it off and restarted. Still noisy. Tried for a 3rd time and it was NOT the charm. She won't crank and acts like something is locked up in there. Crap, crap, and double crap!!

Guess I'll find out how good my extended warranty is.........

Now I need to find a trailer to get it up to Lone Star.
Let's hope for the best.

Do you have the new or old version of the cam tensioner? And, I am assuming you didn't get to the skip guard?
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post #3 of 80 (permalink) Old May 8th, 2011, 7:01 pm Thread Starter
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62K on the original tensioner. And no skip guard.

Doug Turner
'86 Concours
'99 K1200LT - gone
'06 K1200GT - the new kid in town
'08 Wing - gone
Marshall, TX
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post #4 of 80 (permalink) Old May 8th, 2011, 7:40 pm
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Ouch. But engine speed was low so hopefully just a replacement/re-timing of the the cam drive will get you going again.

And make sure they throw an upgraded tensioner and jump guard in there!
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post #5 of 80 (permalink) Old May 8th, 2011, 7:41 pm
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Quote:
Originally Posted by dwsdad
62K on the original tensioner. And no skip guard.
I hope Mike at Lone Star will have good news for you. Please let us know how it works out.
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post #6 of 80 (permalink) Old May 8th, 2011, 9:04 pm
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Dude.....so sorry to hear it. Hopefully it isn't too bad. Let us know details....what warranty company and if they cover it with no problems.

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post #7 of 80 (permalink) Old May 8th, 2011, 9:56 pm
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Quote:
Originally Posted by dwsdad
62K on the original tensioner. And no skip guard.
You 62K me 88K it is juat a matter of time and
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post #8 of 80 (permalink) Old May 9th, 2011, 2:31 am
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Quote:
Originally Posted by 1951vbs
You 62K me 88K it is just a matter of time and
Maybe, maybe not. That's like saying that every rider will have a serious accident sooner or later . . .

I did 138K on my '07 GT, and even though I had pretty much every other problem mentioned on this board, plus a few that weren't mentioned, I never had an issue with the cam chain skipping or the cam gears coming apart.

I still think this is a low-probablity problem, with a high damage result. So I'm doing the jump guard, but I'm not stressing about it.

Ken
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post #9 of 80 (permalink) Old May 9th, 2011, 8:12 am
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I admit I haven't paid attention to this problem or this thread. What's a jump guard?
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post #10 of 80 (permalink) Old May 9th, 2011, 10:50 am
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Quote:
Originally Posted by chuckwilmot
I admit I haven't paid attention to this problem or this thread. What's a jump guard?
Short story, there have been a number of instances of unexplained failures of the cam drive mechanism in the slant-K bikes. When this occurs it can result in major engine damage because the slant-K is an interference design, meaning if the valvetrain gets out of time with the pistons/crankshaft then parts can contact each other with disastrous results.

The jump guard is a small plastic part that mysteriously appeared on the BMW parts list last year, and while BMW has said little it is speculated that this part is in response to the valve drive failures. The jump guard fits close to the lower camchain drive sprocket making it impossible for the chain to lift off the sprocket. Current thought is that the cam drive failures may have been caused by certain rare modes of operation (particularly during starting it seems, when the hydraulic cam chain tensioner is not yet up to full pressure) that allow the cam chain to either whip or become loose enough to slip a tooth or more, resulting in a valve timing problem that allows engine parts to collide (as described above.) The idea seems to be that if this condition should occur the jump guard will prevent the chain from lifting enough to skip a tooth, preventing the problem... or so we all hope.
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