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2004 FS650 - Aluminium shaving in oil filter

Joined Jan 2022
33 Posts | 4+
France
Hello,

I have a 2004 FSE 650, engine completely rebuilt, all New apart from the big end bearing.
After 2 hours of breaking in I replaced the oil, all good.
After 2 more hours on track I found very small flakes of aluminium on the oil filter.

I checked the timing chain, even if new, still 10mm from the casing, only 3-4 clicks left on the tensioner though..
Checked also the top end, nothing loose and no flakes there, but I saw that at some point that the cam shaft rubbed against the head, but I dont know if it was already there before the rebuild. See picture.

Took the small clutch cover off, did not see anything wrong, I'm trying to avoid removing the full clutch cover, I have no leak so far and it was a pain in the *** to fit without the kickshaft spring going off...

Any others ideas where it could come from?
I have to say that I was running the engine a bit hard during the last half hour, old habits of the 4 cylinders kicked back in and I was running a bir short final drive.

Thanks!
 

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no idea.

remove that decomp stopper bolt before it breaks off and damages your engine.

Taffy
 
Hello Taffy,
Thanks for the advice, with this spec I can just let the decomp lever stop on the cam wheel bolt?
 
Could it be the camchain removable link rubbing against the sidewall of the head? I placed it with the plate outside.
I saw that the chain took a chunk of the excess of head gasket at the front..
 
Ok thanks! So I should place the removable plate of the chain link on the inside? But then it will eat through the front chain guide.. I didnt see permanent rivet links on your store?
 
leave it as it is, it'll eventually stop doing it.

Make sure that the camchain tensioner has some 'clicks' left to spare.

You can check the alignment of the top sprocket over the bottom sprocket. if they are not in line then the chain will not only 'curve' up and down but also wear rapidly.

Taffy
 
Ok thanks!
Yep I had 4 clicks left with the new chain and original 2004 blade, I broke it trying to bend it so I will mount your blade.
The alignment I dont really see how it could be wrong, the bottom sprocket cannot be adjusted except if mounted the wrong way, and the top sprocket is limited by the bearings and the cam shaft end cap?
 

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