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I'm working on my cousins mower with a B&S 31S8770001 G1 code 15111820. He was mowing and it shutoff and would not crank back up. I checked the spark at the plug and it has good spark. Checked the compression and it was around 80. Checked the valve adjustments and they are around .005. So I...

Can anyone tell me what Horsepower this engine is? It is on a used mower that my son-in-law has on a Craftsman lawn tractor. The tractor says it has a 20.0 HP, but the cowling on top of engine says it is a 17.5HP. I suspect the engine was worked on in a shop and somone may have put the wrong...

Motor starts and runs, but keeps speeding up and slowing down. Governor is fluctuating, but it also backfires. I cleaned the carburetor and it was full of gunk, but no help. So I replaced the carb, still no help. This is a 31C7071346B1 engine. Hooked up a timing light and it would strobe, but...