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My kid had a PW50. The best mod I did, was to ditch the oil injection, and run mixed gas. That thing would literally plug the silencer every 5 hours. (Bone stock and brand new). Adults riding it wide open for miles at a time wouldn't produce enough heat in the pipe to clean it out.
I used to put it on a stool, and get it hot. The run it wide open for a while with a mapp gas torch on the pipe/silencer to burn the soot out of it. It didn't matter if I used Yamalube synthetic, Royal Purple, or Lucas. It always plugged up the pipe. The oil injection was a bad design on the PWs.
Personally, I would get the PW running well and sell it. Buy a CRF 50 4 stroke. It's a far superior bike.
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