What type of fuel can are you using?
I still have a hard time believing that type of discoloration and buildup happened in just 6 tanks of fuel, and for this to happen twice now is questionable, but I guess anything is possible. Take into consideration weed eaters and blowers run at lower rpm's and lower temps than saws, so what happens in a saw might not in a blower.
We don't really know what the dealer allegedly fixed after he first took it in. My wild guess is..not very much! That could be why it still looks rank. Don't know, can't say, even the OP can't say, he wasn't back on the bench at the dealers. New ring, throw it back together with the old cylinder?? Who knoweth....
Thing is, this is autotune, no limiter caps, no user adjustment, it is supposed to "just work". And by all acounnts here, MOST of them "just work". Most guys here have zero probs, and the dealers here have reported zero or minimal probs, but..we have had a few reported with problems, and I for sure saw one with serious problems.
*shrugs*
One would think that the OP would be very careful about his fuel mix after blowing up his first 550xp :shrugs:
Good grief guys if I was any more careful about mixing fuel I would need a degree in nuclear physics lol
That's what I figured.
It's not inconceivable that you got two duds that came off the assembly line one after the other.
2xdefective carbs is possible, if both are early ones - I would like to know the serial number of both saws
The dealer did not fix this saw, it is a brand new one that the OP received after his first blew up. Read the previous posts...
2xdefective carbs is possible, if both are early ones - I would like to know the serial number of both saws
2xdefective carbs is possible, if both are early ones - I would like to know the serial number of both saws
Here's a pic with different exposure and the piston in a different spot.
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I wonder why there is a horizontal line about 1/3rd the way up the piston, there is some scuffing below it and there is very little scuffing immediately above that line. Farther up, the scuffing is more severe.
Could the line be a shadow?
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