Pics of my Piston....

triple

triple

New member
Joined
Dec 3, 2005
Messages
120
Age
44
Location
Madison, NH
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Compression was 140 on PTO, 30 on middle, 140 on MAG.
 

Some wanted to see what it looked like, so here she be. To me it looks like piston failure, then the ring ripped up through and did it's work. The outer pistons are maybe a little rich, but they pulled 140 psi before I tore into it.No problems on those cylinders.
 
Man really hard to see good, looks like some det. on that front side there,
then the ring caught and broke and maybe bouncing around did the back
side damage to that edge...hard to see.

is that missing piece at the back broke off OR eroded away??

jetting on the other two don't look to bad..were you running fresh premium
gas and BR9ECS plugs?,,i see allot of blow by too..

any chance of some better pic's????
 
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I see a problem pointing to a airleak either in the rubber carb boot-(sometimes you have to flex them to find the cracks),reedblock-(I see it has aftermarket reeds so someone has been in there before, possible reusing the metal gasket on the plastic reedblocks, base gasket-(can have burrs from prior times, cylinder not seated on dowel pins all the way,nick in bottom of cylinder to gasket surface), or incorrect carb settings in the center cylinder. Did you ever check the needle and seat,float level, needle settings? the other 2 pistons look good on top, this was not caused by running non br9ecs sparkplugs. I read that this has happened before same cylinder, so its likely something you just overlooked the first time, and it must be a small leak or wrong setting because you got 400 miles or something before going again? its getting either more air thru a leak or something like the needle setting in the carbs are incorrect on the center cylinder only.
 
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