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  #11  
Old 21st November 2012
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Quote:
Originally Posted by Gcram399 View Post
Well, did you find anything out yet?
I was going to say to pull the plugs and take a look at them. If they are both oiled or oil fouled it might point you towards wet sumping from the oil not being returned to the bag. If only one is oiled or fouled I would look at piston or ring problem.
Just remember that I'm only an arm chair mechanic. A compression and leak down test may be in order. Just three things to try without firing it up.
I haven't had time yet. I'm having two days off the end of this week to do some jobs in my house. But I think we already know what I'll end up doing
And the things you mention are good ones George !
I was thinking of doing a compression test as well.
Thanks for thinking with me NorseXL and George
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  #12  
Old 22nd November 2012
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Ouch ! 2 sparkplug with oil on them and compression test says Front cylinder 270 And rear 55 psi.

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  #13  
Old 22nd November 2012
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That doesn't sound good. Time to remove that rear head.
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  #14  
Old 22nd November 2012
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Found it
The exhaust side of the rear piston is completely gone..



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  #15  
Old 22nd November 2012
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Uff da, any clues to what may have caused it?
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  #16  
Old 22nd November 2012
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Doesn't look too good now does it ?
A huge chunk of the piston broke off and is now somewhere in the engine case.
I guess that has to be taken out before ever starting the engine again..
Also there is some damage to the engine case looking at the second pic.
Just wonder what could have caused it.
I put my new exhaust on about 50 km before it happened. Could it be that a leak on the exhaust caused this ?
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  #17  
Old 22nd November 2012
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Quote:
Originally Posted by sep69 View Post
Doesn't look too good now does it ?
A huge chunk of the piston broke off and is now somewhere in the engine case.
I guess that has to be taken out before ever starting the engine again..
Also there is some damage to the engine case looking at the second pic.
Just wonder what could have caused it.
I put my new exhaust on about 50 km before it happened. Could it be that a leak on the exhaust caused this ?
Sorry for your troubles, but you diagnosed it correctly in your first post.
As for cause, perhaps a lean condition, but that usually burns a hole directly under the spark plug
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  #18  
Old 22nd November 2012
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Wow...that's a pretty catastrophic failure. I'll be interested in finding out what caused that.
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  #19  
Old 22nd November 2012
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Well new cylinders and pistons I can buy again.
What do you guys think about the missing piece of the piston ?
That has to come out right ?
I don't think I'll sleep or ride easy with it still in the engine after I get a new set on the bike.
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  #20  
Old 22nd November 2012
Jörgen Jörgen is offline
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From looking on the pics, I would suspect too tight piston ring end gap. That kind of piston damage is typical for piston ring seizure.
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