I'm about to tear into my generator and wanted to see if anyone agrees on what my problem is. I have a Coleman ProForce 2500 generator that is a little over a year old, so out of warranty. Only has about 40 hours on it. Has a chinese engine, 5.5 OHV horizontal shaft that's mated to the generator head. I assume it's a Honda gx160 clone, but someone told me it's idental generator to a Yamaha ef2600 generator. Last time I started it, ran fine for about 30 seconds then started smoking LOTS of white smoke. Took out plug and it has oil on it. Did compression test, has good compression. Runs, but not good. Turn the fuel valve off and as it runs out of gas it's runs better as it leans out and quits smoking, then dies from no fuel. Wouldn't this have to be a broken/bad oil ring?