Yes, my Echo PB-413H has finally given out on me. Compression messed up. A guy that works on 'em took the spark plug out and looked inside and saw metal shavings from the piston rubbing against the cylinder wall. Just my luck. I'll keep it for parts, doubt I'll ever buy anything by Echo again though.
Is this the same blower you previously had problems with? If so, what, if any, actions were you able to take to correct that problem?
Do you know for sure what caused the scoring? Did they tell you? Some of the most frequent problems, but not necessarily in this order or the only causes, are:
1) Poorly mixed fuel (correct quantity of mix oil but just not mixed up in the gas properly),
2) Not enough mix oil,
3) Poor quality mix oil causing poor lubrication,
4) Incorrect fuel/air mixture. Among others, one of the reasons for incorrect fuel/air mixture is incorrect carburetor settings (thus my recommendation in the other thread to not adjust the carburetor.) Incorrect fuel/air mixture is one of the leading causes (if not the leading cause) of 2 cycle engine scoring and failure. When the fuel air mixture is incorrect the engine can race, causing it to get too hot. As a result, the piston will literally "melt" and the aluminum from the piston will adhere to the cylinder walls, causing the "score" marks or "scratches".
5) Another side affect of poor quality mix oil is carbon build up. You may ask why I bring this up when I am discussing the scoring of cylinders. Glad you asked. Poor mix oil quality creates carbon buildup. This carbon buildup adheres mostly to inside of the exhaust port. From there, the carbon buildup breaks free after so long and wedges itself between the piston and cylinder causing score marks.
Please understand that the scored cylinder is very likely
not a result of poor workmanship and likely had
nothing to do with the brand of equipment. More than likely one of the above mentioned reasons is why the cylinder scored.
Good luck,
Eli