066.....What happened?

[Plan-b]

This sort of piston damage happens just as the engine starts up from a cold condition, the saw will still run for quite soime time afterwards but the damage has been done. I live in a cold climate, cold for 4-5 months of the year. I have seen many cold scored pistons come my way over the years. The cylinder is cold, it has cooling fins and more mass than the piston. The piston expands more rapidly than the cylinder.

It's cold in NS?

 

[Adirondackstihl]

Bottom end is clean as a whistle

 

[Adirondackstihl]

Little bit left to clean up

 

[blsnelling]

Must be on your end Brad, they show fine for me.

A reboot fixed it.

What kind of piston was this? I wonder if it was too large with not enough clearance.

 

[Duane(Pa)]

I posted a thread the other day about de-comp failure. I thought they busted and puked metal into the jug. Most that replied said they leaked and subsequently smoked the top end. IDK? minus 6 seems like a huge red flag to me. Looks like you will have it back in service pretty soon.

 

[chadihman]

Bottom end is clean as a whistle

this clean?

 

[Adirondackstihl]

A reboot fixed it.

What kind of piston was this? I wonder if it was too large with not enough clearance.

MAHLE P&C

Saw is extremely low hour.
Untouched since the day it left Germany

 

[Adirondackstihl]

This is her

 

[blsnelling]

MAHLE P&C

Saw is extremely low hour.
Untouched since the day it left Germany

That's a shame. I hate these head scratchers when you're not sure what happened.

I had a 045 that seemed to run and tune fine. It turned out to be a crank seal that only leaked enough to cause a problem under extended heavy load.

But as others have suggested, that doesn't look like a heat related seizure.. Really strange. I'd vac test it anyway.

 

[Adirondackstihl]

That's a shame. I hate these head scratchers when you're not sure what happened.

I had a 045 that seemed to run and tune fine. It turned out to be a crank seal that only leaked enough to cause a problem under extended heavy load.

But as others have suggested, that doesn't look like a heat related seizure.. Really strange. I'd vac test it anyway.

It's getting all new lines and seals.

 

[pioneerguy600]

It's cold in NS?

Cold enough, seen -21C several times, been below freezing for a couple months on end this winter, cold enough when starting a cold two stroke to let it idle a minute of more before revving it up and plunging it into a cut.

 

[Mastermind]

It's messed up Jeremy.

Hell man, Ray Charles could see that.

 

[Plan-b]

Cold enough, seen -21C several times, been below freezing for a couple months on end this winter, cold enough when starting a cold two stroke to let it idle a minute of more before revving it up and plunging it into a cut.

.... and you guys had lot's of snow this year...

 

[huskihl]

I'm with pg600. I've seen this with water cooled 4 wheelers in winter. It happens and you don't even know it.

 

[Adirondackstihl]

It's messed up Jeremy.

Hell man, Ray Charles could see that.

Phuck n eh

 

[Mastermind]

Phuck n eh

So fix it.

Next problem?

 

[Adirondackstihl]

So fix it.

Next problem?

I'm workin on it!
Gotta save muh pennies

 

[blsnelling]

I'm workin on it!
Gotta save muh pennies

Save your quarters and it won't take so long!

 

[Trx250r180]

Should have bought a husky

 

[Adirondackstihl]

Should have bought a husky

Pharkewe