37k miles on new engine, brand new carb,pvc valve, plugs, dist/rotor, air and fuel filter. The thing sucks gas! Can't figure out why, it was a factory rebuilt carb I put on it and it still gets crappy mileage, the same as before I put the new carb on it.

Every once in a while it will stutter, and then want to quit when I come to a stop. I give it a little gas to keep it revved up and it works fine for a while but will act up still. The timing is ok too.

One other thing...there are two green, round plugs on the left side of the engine (if you are facing it). One of them, the closest to the carb has a broken off wire. What do those plugs do? Could they affect mileage?