Troy Bilt trimmer overheat and ruined motor but other 2 cycle equipment ok?

Hello all, this might get long winded from me
My first new piece of yard equipment - ever - I bought last year at the end of mowing season. It is/was a cheapo TroyBilt string trimmer (I will get model numbers when I get it back). It has been used probably less than 15 hours or so. Last year while doing a long stretch of trimming it just died and would not restart. I let it sit overnight and the next day it ran just fine. This year I gassed it up, it started first or second pull and runs just fine. Again using it during a long stretch of trimming it died and would not restart. I thought 'wow, I have something with a warranty' so I took it to the shop. I was out of town but was left a message saying they had looked at my trimmer and noted the tank was empty (yes, I emptied the gas before I put it in the car) but when they pulled the spark plug it was white and when they pulled the muffler the cylinder and piston were scored so they were figuring the gas had no oil in it so the trimmer overheated so it is not covered under factory warranty. Oh, said the compression was around 60 psi as well.
I have no reason to doubt their findings but strongly disagree with their assumption. I have several other pieces of 2 cycle yard equipment running just fine after being fueled from the same gas can of fresh gas mixed with that 2 cycle ' pro mix ' oil from lowes.
I guess my question / thoughts are: Has anyone had experience with using Pro Mix? Could the reason the engine overheated be because being so new and I imagine so lean from the factory?
I am just at a loss and want to know why this happened so if anyone has any ideas I would love to brainstorm!

 

They are set lean from the factory... too lean. They build junk and then it's hard to prove it's their fault not yours. One reason to buy something decent... even if it's used. I buy a lot of used tools at the pawn shop in order to get commercial quality at affordable prices.

 

Is there any way to get an analysis of the remaining gas you have in your gas container to see if that really had anything to do with the issue? Don't know if there's any practical method to determine the oil ratio of the mix without going all CSI on it though.
If they deny the warranty claim there should be some more concrete proof other than an assumption based solely on those symptoms.
I'll have to keep that in mind about Troybilt quality, didn't know much about them.

 

Thanks for the responses.....I feel a little better anyway knowing that it doesn't make sense. I am sure the warranty is denied even based on that phone message, I want to know now for piece of mind. I will try and contact the oil company to see what they have to say.
Cheese, I'm with ya' on the used quality equipment but here is the story on that. After being around here for so long I kinda knew what I was getting but 'got a deal' on the new troy bilt. My whole life has been getting used free stuff from friends in exchange for fixing their stuff. I went to visit in-laws this past weekend and came home with 3 more trimmers...broken... so.....I do however have a real nice heavy duty one on the bench waiting for me to find parts....a Robin NB411 I think? I knew what I was getting new was junk but figured I had a warranty and it gets used so little I would give it a shot. Lesson learned.
If I hear any further on this I'll let everyone know. Thanks for listening!

 

Good deal, robin made quality stuff.

 

Thanks!!
I won't keep this thread going but had to add two things.....another big part in my keeping the el cheepos around is the fact that I have so many attachments that I use.
Second - the Robin unit looks like its well made but where does one find parts for it? Is there some cross reference somewhere? I found a manual and an IPL online but they do me no good. Thanks in advance if anyone knows.

 

Type in "robin trimmer parts" in google and there are several places that carry them. It's been a really long time since I had to order robin parts. I rarely see them around here. I used to own one and use it regularly.