Originally Posted by Audiofn

Did you punch a hole in the cylinder or just have alluminum come off the piston? I have had a LOT of luck getting the allum. off the cylinder walls when I melted down a few pistons. Acid and scotchbright pad. It takes time but does work well.

Originally Posted by allstarmarine

in reply to the 2 bottom burned cyl. i would almost bet you got water back up thru the exhaust.could happen by coming off plane hard ,motor mounting to low ,excess water in bilge ,large wave hitting back of motor ,excess wieght on back of boat .seen it alot in my area ,people gather on back of boat at island to party ,drink and swim and flood to bottom cyl. also had a boat go into water no bottom plug and when he realized it started it up to put it back on trailer and burned two bottom cyls.this is also common on bracketed boats because the motor is so far off the back of boat it goes deeper than normal

Originally Posted by racer-x6

Check the string gasket between the cyl. and the exhaust plate. Does the exhaust plate look clean where the exhaust comes out of the cyl. ? if the leak is on the exhaust side it will suck water in on the down stroke. It is unlikely the both head gaskets failed at the same time.

Originally Posted by rchevelle71

Not sure where this string gasket is, but I will take a look at the exhaust tomorrow.

Originally Posted by racer-x6

its behind the exhaust plate, look at the exhaust plate close for any holes.

Originally Posted by matt81

i thought half the fun was broken and bloody knuckles?

Originally Posted by rchevelle71

do ya mean the adapter plate under the powerhead??