I have an early 2000 pw50. It quit running last year, I tore the carb apart and found the choke was frozen shut. I replaced the carb with a Chinese knockoff from ebay and a new set of reeds. With the new carb it would fire after several kicks, run very poorly for a minute then die. I figured it had to be the carb still, so back to ebay I went. This time I bought a used, working condition, oem carb. Threw it on and sure enough, exact same problem. Took several kicks to fire, and it would only run briefly and poorly at that. At this point I figure it has to be the top end, although I never checked the compression.....so I tore the top end off. The piston and cylinder were badly gouged. Finally, this has to be my issue right? No...I put it all together this evening. Nearly as excited as my son standing next to me I tried starting it. After several kicks I realized I forgot to put gas in it. Still holding out hope, and now with a half tank of gas I begin kicking,,,and kicking...and kicking. After, what seemed like 100 kicks it fired. But....symptoms are exactly the same as before. Im stuck, not sure where to go from here. Im thinking maybe crankseals?, but that's merely a guess. Any suggestions on what to check next?