I bought a 1996 wellcraft 23 excell with a 1996 johnson 200 at the end of last season. It was rebuilt in 2003.<br /> A mechanic checked the engine - said it was good - and I test drove it for about an hour - and it was running perfectly. I then let the mechanic winterize and store the boat/engine on land..<br /> A few days ago, they put it in the water, tuned it up, and took it out for a test drive. (I wasn't there). The mechanic said it ran fine for a few minutes, then he heard a pop and the engine lost power.<br /> He said the engine is beyond repair. The cylinders are "blown" they looked burned.<br /> He said he was talking to friends about it, and they also heard of similiar things happening with other engines recently. <br /> They are thinking it may have something to do with the ethanol in the gas (the gas tank was stored filled and stabilizer was added when it was winterized) seperating out and the engine running on the ethanol alone burned too hot.<br /> Doesn't sound right to me.. anyone hear of this type of problem?