What i woul look up on 55 that id be interest to buy :
-whats the cylinder like, can be checked easily after pulling the plug off, with a flashlight, when piston is down, youll see if theres molten aluminium residue around exhaust port. Minimal amount can be taken care off, with acid and or hone, and new piston or just a piston ring sometimes.
-pull off the muffler and see hows the piston wall, if its all scrathced and molten with bad ring, pressed between molten piston material, youll need a piston at least for sure.
- if the things mentioned above exist, take off the carb and the intakes plastic flange as well as the rubber intake boot, to see if the tiny pale rubber grommet next to the inlet port, in the cylinder, is torn, worn, split or anything suspicious. Its about the only weak point in the 55 if you aske, as long as the oil pump works and the cooling fins are free from major dirt amounts.
-Sometimes, though the fuel line, from tank, vibrates itself broken, and you might not see it with a quick look, as the broken, leaking fuel hose, is usually, hidden just inside the rubber grommet seal, between tank/handle part and the crank case part. Piece of that yellow silicone fuel line lasts a lot longer than the black oem-style fuel line, in my experience.
-Choke levers sometime wear, as they vibrate against the engine, but its nothing serious. Ive had just one, that split up in two pieces in the forest but piece of steel wire replaced it for the rest of the day.
-Ignitions are fairly reliable, ive never had ignition busting up.
-55 enjoys a lot, breathing easier, meaning that you might like to open up the muffler a bit, theres many ways. The saw will run cooler and have bit more power too.
-Leaving off the cylinders gasket is a cheap good trick too, more compression ratio is good.
- i run mine, with 13-15-20 bars with no problems, but it has a ported cylinder too and with 13 and 15 bar i use 8 pin chain sprocket instead of stock 7 pin one.
