With the spark plug out the starter spins the flywheel easily. The push rods, rocker arms, and valve stems all move as I think they should. The starter rotor has no end or side play and all brushes are good. [ took the end plate off but did not remove the rotor. The battery voltage is 12.54 at the terminals. With the plug installed, the starter will rotate the flywheel to a point and stop. When the starter is deenergized, the flywheel rotates slightly in reverse. Any help would be appreciated.
Adjust the valve clearances. One or both are opening too late. Find TDC(top dead center) of your compression stroke for each cylinder before adjusting.
Starter "stall" is typically from decompression failure. Most likely cause is improper valve lash. See maintenance schedule.
SOURCE: roller rocker meets valve stem tagging inside of spring
They make valve stem caps to raise the hight of the valve stem & stop the rocker from making contact with the spring retainer.Good luck,
ChevRev
SOURCE: i need to adjust rocker arm clearance on a 15.5 briggs engine
you go to the briggs & stratton website, already knowing the numbers from the side of the engine, you look the clearances up under support.
you go to you tube and search, i am sure there will be some videos on there for adjusting rocker arm clearance. one short movie is worth a thousand words. the key is to understand the timing. where the piston is in relationship to where the valve should be. once you have them adjusted, make sure you turn the engine over a few times without the plugs in, and then do it again.
SOURCE: My 24hp Briggs and Stratton ohv engine has bent push rods.
unable to answer if valve opened or not but does sound like ur bottom valve is bent or piston made contact and bent it to fix need to remove head and replace valve also need to inspect piston face is not damaged from possible contact
SOURCE: 22 hp. Kohler engine has new push rods and rocker
check the valve lash sounds like you have them adjusted wrong, put the piston top dead center, with the rocker arms level with each other before you set them
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