This 066 Grenaded........What The Hell Happened???????

[Mastermind]

These two pics tell me a lot about what killed this engine......

 

[banana boat]

Looks like a bearing came appart or a ring locating pin fell out

 

[Trx250r180]

why is the top ring a rainbow color ,and no sign of oil on the piston or inside the muffler ?

 

[GrassGuerilla]

opcorn:

 

[Tractorsaw1]

Looks like small carb screws played hammer time on top for a while.

My 064/66 aftermarket piston with popup gave up the ghost sunday, part of the piston top came off. It really kicked for 5 years, so now Im in the same boat

 

[Mastermind]

Looks like a rock got thru the air filter

It sure does don't it?

Bad bearings?

That doesn't insure they will stay that way though.

Looks like a bearing came appart or a ring locating pin fell out

What killed the bearing though? Compression? Raw power? I've built dozens of 066 exactly like this......no failures.

why is the top ring a rainbow color ,and no sign of oil on the piston or inside the muffler ?

You are on to something Brian......

 

[The Ripper]

where's the spark arrester or what ever you call it .

 

[HuskStihl]

Exhaust side damage, picture of hollow muffler as a clue? Something from the muffler got in and krunked it up? I can't see anything else missing or broken. (Believe it or not, that's a serious guess)

 

[Mastermind]

where's the spark arrester or what ever you call it .

Still in the muffler where it's suppose to be.

Exhaust side damage, picture of hollow muffler as a clue? Something from the muffler got in and krunked it up? I can't see anything else missing or broken. (Believe it or not, that's a serious guess)

That muffler shell is awfully dry ain't it? Where is the oil?

 

[Trx250r180]

amsoil 100 to 1 opcorn:

i run 32 to 1 like you had me do ,when i tune by ear in the cut ,i adjust rich till it burbles then cleans out in the cut ,every time i inspect my piston ,it is slick in oil ,and oil in the muffler some ,i see no oil here like in my saws ,too lean on oil will kill the bearings in i hi-po saw

 

[The Ripper]

Still in the muffler where it's suppose to be.



That muffler shell is awfully dry ain't it? Where is the oil?

Ran non mixed gas

 

[Mastermind]

It's even dry in here......that's weird huh?

 

[Plan-b]

These two pics tell me a lot about what killed this engine......

Is it me, or the left side muffler bolt have carbon under where the head of the bolt should be?

 

[machinisttx]

Bearings locked up(no oil), then disintegrated, followed by pieces of the race getting sucked up the transfer port into the combustion chamber?

 

[Mastermind]

amsoil 100 to 1 opcorn:

i run 32 to 1 like you had me do ,when i tune by ear in the cut ,i adjust rich till it burbles then cleans out in the cut ,every time i inspect my piston ,it is slick in oil ,and oil in the muffler some ,i see no oil here like in my saws ,too lean on oil will kill the bearings in i hi-po saw

Amsoil Saber @ 80:1

Didn't that long to kill it either.

How many tanks of fuel Troy?????

 

[HuskStihl]

Ran non mixed gas

No way. Who lends a masterminded 066 to their BIL?

 

[moody]

Gassed

 

[struggle]

the only thing that I see or question is that the muffler is not dual port or and extra port added and if you ported it I would think there should be an extra exhuast port so me thinks that you didn't send it out with a regular cover like it has on it now? Possibly when owner changed the cover or something a bolt of washer was left in the muffler shell and found its way into the cylinder.

Its a stretch but all I can think of?

 

[machinisttx]

The new pics look like the rod bearing disintegrated...

 

[Mastermind]

Bearings locked up(no oil), then disintegrated, followed by pieces of the race getting sucked up the transfer port into the combustion chamber?

Bingo......

It had oil, just not enough for the pressure it was under.

Gassed

No scoring on the piston.