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What is the gap on a spark plug for 3.5 hplawn mower?

The correct spark plug gap for a 3.5 hp lawn mower engine is typically between 0.028 and 0.035 inches (0.71 to 0.89 mm). You can find this information in the owner's manual for your lawn mower or on the spark plug packaging. It's important to maintain the proper gap as specified by the manufacturer to ensure the engine operates properly and efficiently.