opinions on the demise of this Meteor 390 top end - big pic warning

[Definitive Dave]

returned by a customer
looking for independent opinions on what happened before I call him

 

[sunfish]

Sure looks like it was run too lean, air leak, bad tune, or straight gas . That's about the only thing that causes that.

 

[Big_Wood]

i have to say that is the start of lean scoring. he was smart and shut her down before it went out of control though.

 

[KYsawman]

I am with sunfish on it looks to me like lack of oil, to have scoring all the way to the bottom of the piston skirt.If running lean you would see more damage on the top edge of the pistom above ring groove. you would have to measure clearances but it could be cold siezed, caused by close tolereces and wide open throdle on very cold engine. I used to see alot back home in alaska on snowmobile engines. Start it up and hold it to the bar.

 

[Chainsaw Jim]

There are also black deposits on there from what could be from old bad mix.

 

[cus_deluxe]

how many tanks on this top end?

 

[windthrown]

Straight gassed, or run too lean.

 

[Moparmyway]

All I see is dry, dry, and more dry
Looks like Amsoil @ 100:1
I lump in with windthrown ...................

 

[Definitive Dave]

I'll say all I know about it after a few more folks get a chance to chime in. And if you want to guess what the customer blames and what the Husqvarna dealer said was the issue you can get bonus points

 

[windthrown]

The customer will say, "One minute I was smoking a giant bong with Snoop Dawg and like, I blacked out and the next thing I know I was wandering around with a chainsaw in my hands..."

 

[windthrown]

The Husky Dealer will blame it on BAG GAS!

 

[beaglebriar]

I'm going to say whatever smoked the original P/C was never repaired and hence this one suffered the same fate. I'm going with air leak.

 

[Mattyo]

He never diagnosed the original problem

 

[Jacob J.]

Did the customer install this themselves? They may have folded the base gasket over or compromised the intake boot. I also see what looks like a water deposit up high.

 

[ANewSawyer]

WARNING: I am not the most knowledgeable person about engines!!! My opinion: I am not seeing a lot of oil. I noticed the other day that a Husqy backpack blower run at 32:1 had a noticeable film of oil on the piston when viewed through the exhaust port. I, personally, am going to go with the guys above and say straight gas. Dave, is there a chance we could we see a pic of the inside of the muffler?

 

[MontanaTed]

You know I'm pretty new here but the first thought so had when I saw the piston head was the it doesn't look like any oil or very little in the mix. Straight gas to me but I'm still learning so take it for what it worth, no carbon build up at all is fishy.

 

[fearofpavement]

It obviously got hot. Why? I have to vote with the straight gas guys.

 

[tickhound93]

Looks straight gassed. Cold seizure would normally result in 4 distinct scoring areas adjacent to the ends of the piston pin, where the piston is the thinest and expands the fastest. May also guess he put kerosene in it? I don't see enough melting on yhr piston crown to indicate a lran condition

 

[VinceGU05]

Nothing wrong with it. I pulled this out if a working 039.




Sent from my iStihl.

 

[idiotwithasaw]

Looks like he is trying to get money from his own mistake. Gotta remember to find what killed ur original top end and add oil to your gas.