Got 4 out of the 5 weedwackers running that have accumulated in the back of my shed over the years from garbage picks. There 5th has no compression.
Spent half the day on them, only one of the four was easy to figure out, carb needed to be cleaned. I cleaned them all but the other 3 still had issues.
Spark arrester was clogged on one causing no power and bogging, another had a big heavy aftermarket head on it that was making it act like it had no power, and the last took the longest. Almost gave up, well I pretty much did. I knew it wasn't getting enough fuel at high rpms, high speed screw didn't help, carb was clean and everything but couldn't get it to work right. I noticed a brass port that press fit in that had a valve in it, and decided to remove it, which of course means wrecking it. Drilled it out and saw a rubber valve in there that was disintegrated, left it out and reassembled the carb and took a shot in the dark. Amazingly it ran great, who knows what that valve was for. Oh well. It runs now
They all got the tanks cleaned out, fuel filters cleaned, air filters cleaned, and got tuned. 3 needed fuel lines, I bought bulk line a few years ago. Just got a chainsaw and lawnmower left. That kept me busy and I'm glad I got that done.
Both weedwackers at my uncles place are not running right, I just tried using them yesterday. The homelight sounded horrible, the engine was racing real high and bouncing around when not even touching the throttle. Very strange. Sounded really lean, mixture screws did nothing.
I'll bring these there and those back home to fix.
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