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Author Topic: Whats the cause of this?  (Read 1336 times)

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Offline NSR

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Whats the cause of this?
« on: May 03, 2010, 09:02:14 pm »
I took the head off the Suwm today and found a film of unburnt oil covering the squish area. 
Any thoughts, does it matter?  I haven't have the head off for over a year so done a bit of work.
 


   
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Offline matcho mick

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Re: Whats the cause of this?
« Reply #1 on: May 03, 2010, 10:35:51 pm »
replace the inlet stem seal ;D
err,maybe the last mix transferred with ignition killed,fuels evaporated over time leaving oil residue,but dosen't explain dry piston top ???
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Offline Lozza

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Re: Whats the cause of this?
« Reply #2 on: May 03, 2010, 11:04:01 pm »
It's called a piston wash pattern. Stick to fibreglass Mick ;D ;D
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Ji Gantor

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Re: Whats the cause of this?
« Reply #3 on: May 04, 2010, 12:17:33 pm »
What Lozza said, that is the pistons wash pattern.
What does the underside of the piston look like.

Ji
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