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Lots of oil in the cylinders, occasionally starts running on one cylinder, last time on one cylinder, so much carbon around the spark plug hole I figured it was time to tear down have a look see. I put a new head gasket on about 17 years ago, that is the only motor work I believe has ever been done. I am the third owner, moto never apart as far as I can tell. I will post some of these pitures again as I have a few questions...Pics are the front cylinder
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Rear Cylinder Pics -
Uh-Oh! Front Cylinder Top Ring was broken!Comment
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Leversole,
Your combustion chamber, which the cylinder bore and piston assembly is a direct part of, definitely shows signs of wear as it should at its age.
Proper measurements and calculations should be taken throughout the top end. This includes rocker arms, rocker supports, valve's, guides, seat dimensions, cylinder bore X&Y through stroke travel, etc...
Duke KlemanComment
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You got real lucky with that broken ring not causing severe damage.Bob Rice #6738Comment
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Bob, I sent you an email yesterday.Originally posted by BigLakeBob View Post
RobbieRobbie Knight Amca #2736Comment
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Started the disassembly of the rear head...
First time seeing daylight in 62 years! the rocker bushings have zero play Tight and smooth!
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Exhaust valve not pretty...obviously not seating...valve has a lot of free play within the guide...the intake was much better, no shake at all, nice and smooth! I guess a lot of the oil was coming down the worn exhaust guide...
IMG_7430.JPG IMG_7431.JPG IMG_7437.JPG IMG_7438.JPGComment
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Leversole,
There are clear signs of the exhaust valve guide allowing oil to be drawn into the port.
I highly suggest using modern valves, guides and seals when you rebuild them. Combined with a proper cylinder bore for oversized pistons and new gaskets you'll have a clean combustion chamber during operation.
Duke KlemanComment
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