Hello folks of aboristsite long time prowler first time poster. Anyways down to the problem I'm facing. So a while back I was given a 1996 husqvarna 55 by my dad. He didn't use it much and always took meticulous care of the saw so it was a total surprise to us when a visit to the saw doc determined that the piston was scorched. I was given the saw and stripped it down to see what the damage was. It wasn't bad I was able to salvage the cylinder. To my novice eyes it looked like an air leak caused the failure. I bought a meteor piston for it along with new gaskets a impulse grommet intake boot and replaced the carb bolts with stihl carb studs. Slapped her together and did a pressure and vacuum test. Held pressure and vacuum for 15 minutes give or take. Everything seemed to be progressing really smoothly until..... I decided to replace the carburetor since the old one had some junk in it. So trying to be thorough I found a factory walbro carburetor new in the box. Everything seems copacetic and as advertised. At this point I can almost smell the two stroke burning and hear the engine screaming so a fresh tank of gas is poured in and I give her a few pulls and a few more. Shes flooded no big deal pull the spark plug varify spark it's there pull the cord a few times to blow the gas out. Well gas just keeps on coming out, everytime the piston goes down it sucks in a whole bunch of gas. So I know there's an issue now this part might not be suitable for the feint of heart, anyways I put it back together and clamp the fuel line to get the fuel out of it, it pops once okay cool un-clamp it it starts but floods so I try it again hoping that the metering valve which is what I believed to be the issue would seat. Finally I decided to put the old carb on and see if the problem was still present. After getting all the gas cleared out it fired up and idled for a bit then stalled. Okay awesome some progress. At this point things go from me doing a little happy dance to soothing myself with beer. Here's what happened I needed to replace the muffler gasket and I figured while I'm in there I can check the piston to make sure everything's fine well I'm sure you guys can guess where this is going. Anyways I look into the port and low and behold there's some small scoring starting to develop well crap so at that point it became beer thirty. I went back out to the shop after a fair amount of cursing and pulled the cylinder off. The piston has some small scores and the cylinder either has been scored or has aluminium deposited on it. I know this has been a very long post hopefully some of you, the ones that made it this far will find some enjoyment reading of my tale of woe. Now to the meat and potatoes. I won't lie although I'm an equipment mechanic I am a total newbie when it comes to 2 strokes but I'm trying to learn. My question is where did I go wrong on this build I realize this is one of those questions that may not have answer. Did I miss the underlying issue with the saw in the first place? I felt I was very thorough when it came to doing the pressure and vac testing sprayed all the gasket surfaces the crank seals and the fact that it held pressure and vac for as long as it did would all seem to point to an air leak not being the issue. Could it have been damaged by the copious amount of fuel that it sucked down its throat hole or maybe when I pinched the line it leaned it out and scored it. I'm just trying to get to the bottom of this so that when I put a new piston (hopefully only a new piston) in it I don't have the same thing happen again. I'm open to any advise on the matter. Thank you guys hopefully at least one of you made it through this long winded post.