Help Im Lost

s10king91

ok so i just bought a 1999 yamaha g16a and i bought it thinking it needed new a new piston and rings and probably bored!! i started looking around the motor and it has oil all over it like really thick and it was at it worst around the head and cylinder so i go ahead and open the motor up (take the head off) expecting to find a mangled cylinder wall but i find less than a cup of oil floating on the piston and the cylinder wall looks ok no ridge at the top no marks from a ring coming apart it looks like maybe a head gasket was leaking is this a common problem or something that would cause the oil to sit on the piston? if it had bad rings wouldn't it seep back down past them ? let me know thanks Daniel

BGW

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DOOmsman

i find less than a cup of oil floating on the piston
What is less than a cup?
Should not be any stray oil in cylinder unless poured in for storage.

s10king91

i was asking if the rings were bad wouldn't it run back down instead of floating on top of the piston or is that incorrect i haven't had any sleep for 48 hours so it may not make sense

jmz

I don`t think the oil got up on top of the piston by the engine running.

Newbylee

sounds like the rings are good! Previous owner could have poured oil in the spark plug hole when they parked it,like dooms said

s10king91

so you think i should just try a head gasket then? im already this far into it i might as well go ahead and replace the rings .Thoughts ?

s10king91

no he told me it smoked the whole time he was driving it he owned it for 5 years so i know for sure that he didn't pour oil in it that and i was driving it well kinda lol wouldn't make any power at all so im leaning towards head gasket or maybe someone replaced rings and did not install them in different directions were the gaps are maybe all the gaps are alinged lol i've seen that happen too but normally oil doesn't just sit on the pistons

gornoman

I'm no expert, but if oils is pooling on top of the piston the engine has a serious defect. That would be the combustion area. There should be virtually no oil there at all. Oil gets splashed up from UNDER the piston. The rings do double duty, they keep the oil OUT of the combustion chamber and they provide compression.

breugel

Run a compression check. That scould answer your questions about the rings. They have a splash type oil system so I doing see how that much oil got in there.

Mike Mac

Dan, I would turn the motor by hand, now that you have it apart. If crank and rod feel ok, put the push rods back in and see if they accuate on the cam, when again turn it by hand.
Look at the oil, smell it, then drain it and look for debris in the oil, if all that appears ok, put new oil in it, then look at the valves, if they again look ok I would reassemble it and then try to wind it over with the starter, with the spark plug out (also disconnect the cdi on the fire wall so you don't burn that up)
Keep a rag over the plug hole cause crap is gona come spraying out of it!
You might at this point do a compression check, like breugel said,and if it seems healthy, try and start it!
Good luck, Mike