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    Steel, plastic or aluminum gear ring. How do I tell?

    B&S 16.5 hp engine on my Murray lawn tractor. My parts manual lists 3 pinion gears based on the ring gear. I'm assuming it's not steel since a magnet doesn't stick to it but how do I know which it is for sure?
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    Doing a "groove" on an engine?????

    I saw a YouTube video by GadgetmanNebraska1 titled "16.5 hp. BRIGGS AND STRATTON lawnmower gains 60% efficiency" in which he says "we've done groove on a 16.5 hp that I put on the forums" but he doesn't say which forums nor what doing a groove means. Someone left a message asking him but there's...
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    Isn't manifold a misnomer?

    I have a 16.5 HP B&S engine in my Murray lawn tractor. According to the B&S manual, the part connecting the carburetor to the cylinder head is call the intake manifold. However, a manifold is defined as "a pipe or chamber branching into several openings.". Since there's only one opening...
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