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 - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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