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Old 01-06-2015, 06:03 AM   #1
Bullskin OP
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Camshaft and bucket coating wear?

I was doing a valve check on my 2010 990A with 42000 miles and found some strange looking wear on one cam lobe and bucket. I have seen some threads in the past about poorly made cams on earlier bikes where it looks like the end of the cam lobe starts to fall apart, but this looks more like a coating. This bike has never had a valve out of spec until now. This intake valve with the strange wear is now at 0.25mm. Is the adjustment loose because of the wear to the bucket or did the looseness cause the wear? Should this cam and bucket be replaced? Is it dangerous for the engine to be running with one intake valve 0.1mm loose? I know loose is better than tight.

 photo cam1.jpg

 photo cam2.jpg
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Old 01-06-2015, 06:25 AM   #2
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On the later cams, KTM gave them a bluing (gun black) finish... Adjust the valve shims as normal and ride, just the bluing wearing off.

The issue was with the cam lobes pitting, only thing I can think of is the bluing was used to monitor wear and identify newer cams.
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Old 01-06-2015, 07:37 AM   #3
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That makes sense. Any thoughts on why there would be one really loose intake valve and 7 that have never moved in 42000 miles?
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Old 01-06-2015, 08:45 AM   #4
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That makes sense. Any thoughts on why there would be one really loose intake valve and 7 that have never moved in 42000 miles?
Pull the plugs and spin the motor, recheck. The tolerances normally tighten up..whilst the plugs are out do a compression test...if good, it is what it is, re-shim to spec.
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Old 01-06-2015, 09:31 AM   #5
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KTM won't warranty the coating.

cost me labor for valve adjustment to find that out.
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Old 01-06-2015, 09:55 AM   #6
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Originally Posted by charlie264 View Post
Pull the plugs and spin the motor, recheck. The tolerances normally tighten up..whilst the plugs are out do a compression test...if good, it is what it is, re-shim to spec.
Thanks Charlie, so what you are saying that it may just be a carbon deposit or something like that keeping that valve from fully seating.
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Old 01-06-2015, 10:40 AM   #7
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Thanks Charlie, so what you are saying that it may just be a carbon deposit or something like that keeping that valve from fully seating.
Sticky valve, bucket..could be a bit of crud....point is if your getting good compression unlikely the valve seat is coked up...Could be an error last valve check...I'll be doing mine in the next week or so....roll on hydraulic valve adjusters...

Check the bucket, make sure the cam hasn't warn a grove...that would indicate that the bucket's not spinning...
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charlie264 screwed with this post 01-06-2015 at 11:03 AM
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Old 01-06-2015, 10:58 AM   #8
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not a whole lot of duration going on to those cams.
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Old 01-07-2015, 02:07 PM   #9
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not a whole lot of duration going on to those cams.
The 990 cams have a shorter lift duration than 950s, interestingly. You can tell by just looking at the profile. There's a big thread about it somewhere :)
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Old 01-07-2015, 06:36 PM   #10
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I noticed similar discoloration on my 07 990 last winter when I last checked the valves. It's not given me any trouble that I'm aware of. Will check the valves again this winter and see if it's changed.
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Old 01-07-2015, 06:56 PM   #11
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I believe the coating was added to extend the life of the cams. With it gone, you are back to normal.

The heat treat problem of the past caused deep pits.

On that one valve being tight/loose. . . The valve train goes through loose/tight cycles, if you checked it again in a thousand miles, it may be the other way.
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Old 01-07-2015, 09:23 PM   #12
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I believe the coating was added to extend the life of the cams. With it gone, you are back to normal.

The heat treat problem of the past caused deep pits.

On that one valve being tight/loose. . . The valve train goes through loose/tight cycles, if you checked it again in a thousand miles, it may be the other way.
I bought 4 new LC8 cams, two were gun black..other 2 normal, the black coating is microns thick....the non metal inclusions in casting that causes the pitting is a manufacturing issue, nothing to do with heat treatment.
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Old 01-08-2015, 03:23 PM   #13
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I had the same on my 2005 rear intake cam. Interesting is the pricing. Why is the camshaft that went bad for me the cheapest ? I am thankful ....


$454.59 Front Exhaust Cam

$339.09 Front Intake

$130.59 Rear Intake

$204.03 Rear Exhaust
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Old 01-08-2015, 06:10 PM   #14
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Quote:
Originally Posted by Zuber View Post
I believe the coating was added to extend the life of the cams. With it gone, you are back to normal.

The heat treat problem of the past caused deep pits.

On that one valve being tight/loose. . . The valve train goes through loose/tight cycles, if you checked it again in a thousand miles, it may be the other way.
Zuber, Sure need some help in understanding your statement. Would you please elaborate. I do want my valve settings to be right.

Are you saying that you can check the valve clearances and they can change in and out of spec back and forth as time goes by.

If so how can anyone ever be sure their valves are staying in spec?

thanks KJ
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Old 01-10-2015, 04:34 PM   #15
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Quote:
Originally Posted by Zuber View Post
On that one valve being tight/loose. . . The valve train goes through loose/tight cycles, if you checked it again in a thousand miles, it may be the other way.
Quote:
Originally Posted by knobbyjoe View Post
Zuber, Sure need some help in understanding your statement. Would you please elaborate.

Are you saying that you can check the valve clearances and they can change in and out of spec back and forth as time goes by.

If so how can anyone ever be sure their valves are staying in spec?

thanks KJ
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