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Been working on engines since I was 13, not so much on small engines. I'd rather have a Briggs cast iron block than an aluminum block. Then the valves would be in the block, not the head (sohv limits life of the engine, needs special oils, and so on). Pressure relief valve looked OK...

Real easy - same rotation with the plug out as the plug in. I'm surprised you would ask.

Koehler Courage engines do not have the best reputation out there. I have a Courage 19 2007 engine that I thought would last forever with good maintenance, but it burned the exhaust valve in the head at around 510 hours. I kept everything clean and the MTD mower under cover during the off...