Re: Running on 3 1/2
Had the same problem with our 2 cylinder lawn mower this past summer. It was so bad it blew oil right out the exhaust. Tore it down and the oil rings looked worn out. I honed the cylinders and put new rings in. Just got it running a couple days ago and no more smoke. Like Wick sez, you need new rings, at least in #4.
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