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Discussion Starter #1
I did a youtube of the noise. (video in the next post)

Don't lost power, the shims valve are OK, change spark plugs, filter and oil, try "seafoam"...

When I used stetoscope, the noise came clrearly from de upper front cylinder, on the right side (oposite to the chain and sproket if I remember)

I suspect cam shaft, rocker, rocker arm, lifter and worst, could be comming from lower parts as pistons.
 

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Sounds like a collapsed lifter, or bent valve. Is it full of oil?
The 900 doesn't use lifters. The rocker arm contacts the shim which contacts the head of the valve stem. That's one of the reasons these engines are so noisy. There's no cushioning of the valve stroke.
 

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Internet Mechanic says:

Internet mechanic says sounds like piston slap. Time to tear off the heads and have a lookski?

How many miles on this faulty 900? Need to ship it to me ASAP your cost I will get rid of it for you!!! :devil2:


Could be a noisy fuel injector :nerd:
 

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Discussion Starter #6
Sounds like a collapsed lifter, or bent valve. Is it full of oil?

Full of oil, yes, and 67000 KM so around 40 000 miles

I will open it in the month. I will have to learn to inspect rocker and more. I just did clearance valves and shims were ok.

Thank you guys, will give more infos and videos when open
 

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When did the bike start to make the "noise" you are concerned about? Can't access the vid at this time.
 

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I agree with sfair about valve train noise. When you checked the valve clearances, how did the cam lobes look? I'm fairly sure you would have noticed if the lobes looked scored. Since the rocker arms slide on this motor (to adjust the shims), are they all fully back in place? Are the cams loose in their bearing saddles? The cam chains sound good to my ear. The noise seems to occur when a cam lobe pushes down on a valve stem, so something is not right there.
 

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Discussion Starter #10
I finally got time to inspect. There is wear on exaust rocker arms and camshaft valve, (2 minutes video) .

I opened the front cylinder for inspection. Seem that it is really worn. Do the noise come only from that ? I hope. But could be coming from throttle assembly ??? I don't know

I bought front cylinder cameshaft valve and intake and exhaust rocker arms

Thanks to every body trying to help me, really appreciated


 

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Discussion Starter #11
I agree with sfair about valve train noise. When you checked the valve clearances, how did the cam lobes look? I'm fairly sure you would have noticed if the lobes looked scored. Since the rocker arms slide on this motor (to adjust the shims), are they all fully back in place? Are the cams loose in their bearing saddles? The cam chains sound good to my ear. The noise seems to occur when a cam lobe pushes down on a valve stem, so something is not right there.
The first time I opened, valve clearances were a bit loose, I changed 2 shims on the intake if I remember. It didn't change nothing for the noise.

The cam didn't seem to have loose, but there is worn and also on the exaust rocker arm (see video).

I wonder what cause that...

(Thank you and sorry for my english, I'm french canadian)
 

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Yes, I can see the rocker arm wear on the exhaust rocker arm. It's harder to see the cam lobe, but it's probably worn too. When you put it together again, you'll have to re-shim the exhaust valves.
 

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I wanted to add, you'll probably need to follow some sort of break in procedure after you install the new parts. Your dealer (or the service manual) should be able to explain what to do.
 
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