Digging up an old thread here, got a relatively new GCV160 i picked up. It smoked a little and ran rough, i had hoped sorting the carb would resolve both issues. Wrong it's obviously not run right for a long time, and the fuel wash has absolutely shot the rings. Oil ring gaps are 0.026" top and second are well over 0.05", it's laughable how thin they are worn down. Good news is the bore and piston look actually look good next to no scoring at all. Tried to use the GXV140 rings, gaps were roughly 0.011 and 0.010 so similar wear to this engine however as i was about to file the 2nd ring gap i noticed the rings in this GCV160 are only 1.0mm wide not 1.5 like early GCV160/135 and GXV140. Does anyone know where to get the correct rings cheap or know of another alternative?