How do you adjust valves on your Briggs and stratton lawnmower engine 15.5?

Answer 1

If this is an overhead valve engine, turn the flywheel clockwise until the piston is at the top of the cylinder bore (top dead center) both valves closed, and then continue to turn the flywheel clockwise until the piston drops down 1/4". Adjust the intake valve between .003"-.005" and the exhaust valve is adjusted between .005"-.007".To measure the 1/4' piston drop down, I do the following : After the spark plug has been removed, I insert a #2 wooden pencil eraser end first into the spark plug opening. I rotate the piston to find TDC and mark the pencil using lip

of the plug opening . I then place another reference mark 1/4" away from the first mark, toward the point end. With the pencil placed in the spark plug opening at TDC, I rotate the piston clockwise until the second, point end reference point matches the lip of the plug opening.

Briggs and Stratton 15.5 HP valve adjustment