MS 660 w cross fire failure

[jackjcc]

Just curious your two cent s on the failure here. There’s the first signs of discoloration of the rod at the top of the it. This is the third rebuild of a massively abused saw. No crank play on either side. Didn’t vac before tear down.

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[Lowbudgetwhiteboy]

Just curious your two cent s on the failure here. There’s the first signs of discoloration of the rod at the top of the it. This is the third rebuild of a massively abused saw. No crank play on either side. Didn’t vac before tear down.

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Lean running condition, the color of the plug says it all.


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[Moparmyway]

I’m guessing little to no chamfer on the exhaust and/or intake. The ring caught on the down stroke and spit out the pieces of piston into the chamber

 

[67L36Driver]

Lean running condition, the color of the plug says it all.


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That’s *B-S....!

 

[huskyboy]

Not lean.

 

[lehman live edge slab]

Nope not lean, plugs tan not white.

 

[jackjcc]

I’m guessing little to no chamfer on the exhaust and/or intake. The ring caught on the down stroke and spit out the pieces of piston into the chamber

I was leaning this way, it wasn’t at a locating pin and that is the exhaust side.


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[Lowbudgetwhiteboy]

Maybe you should find another hobby. [emoji23]


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[lehman live edge slab]

Maybe who should find another hobby?

 

[Stevetheboatguy]

.............

 

[Lowbudgetwhiteboy]

Obviously judging by the carbon on the piston, this saw has been running for a while. Things just don’t all of the sudden break.

The saw got hot and the ring gaps closed.

Or piston broke from heat.

Let me guess you all are the ones who ask around looking for a used oem cylinder.


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[Lowbudgetwhiteboy]

Just tear the saw down all of the way and replace main bearings, seals and install a new piston and cylinder. Then go through the carb and blow it out, pressure test fuel and impulse line for leaks.


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[lehman live edge slab]

That saw didn’t lean burn, plug is tan could have cracked a ring and it caught a port. Some aftermarket rings are brittle as hell

 

[lehman live edge slab]

And I hope you realize this is nowhere near the first saw any of the people on this thread have fixed. They were asking for opinions is all and yes you gave yours but pretty certain it wasn’t lean you must love a black plug.

 

[Lowbudgetwhiteboy]

Just buy all of this and be done with it.

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[lehman live edge slab]

It’s all junk and not worth the time to put it together.

 

[Lowbudgetwhiteboy]

It’s all junk and not worth the time to put it together.

??


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[Czed]

Not lean sharp port edge probably.

What's baffling is how did that damn plug last so long
They don't last no time for me.

 

[lehman live edge slab]

The 29$ no name China bearings and seal kit and the crappy top end you sent pictures of. Both would be a waste of time and money

 

[Czed]

Just buy all of this and be done with it.

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We don't recommend the china stuff anymore
To much inconsistency.
Hard use saws get oem or equivalent pistons and bearings.