Briggs single cyl overhead valve engines have a compression release, its built into the camshaft. It keeps the intake valve from closing all the way till the piston is close to tdc. When the clearance on the intake valve gets too wide, you will notice, especially on ridding mowers, it acts like the battery is weak, and won't turn over. If you pull the valve cover and adjust the intake valve back to 8 thousands, it turns over and runs like new again.
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Today's Featured Article - Talk of the Town: Winterizin Engines - To Drain or Not to Drain? - by Staff. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "Winter is fast approaching..for a gas tractor should the gas tank be drained and run the engine til the carb is dry or do the gas stabilizer products I've heard of work? (tractor will not be used til spring) any other tips for winterizing?? "
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