Outdoor Power Equipment and Small Engines - briggs 14 hp problem

wont start backfires thru carb?

Stuck valve?.....

had head off replaced head gasket both vavle stems were moving.looked in intake and exhaust ports stem were moving.

Engine model and type numbers please.....

Engine model and type numbers please.....
28p777
q644a1
970404zd

Check the valve adjustment, Could also be a piece of carbon stuck under the valve seat area.



Remove the valve cover then rotate the engine over by hand until you reach top dead center compression stroke, Then remove the spark plug. Once at TDC insert a small screw driver in the plug hole touching the piston and rotate clockwise past TDC until you see the screw driver move down inside the hole 1/4". Now loosen the jam screw in the center of the adjustment nut and adjust to .005-.007" both intake and exhaust. Hold the adjuster nut with your wrench while tightening the jam screw. It may take a couple times to get it right because when tightening the jam screw it could throw the adjustment out so check after tightening.

thanks for your help adjusted to .006 started right up. But my oil likes comes on
when i engage blades. It does not come on when engine is running! Only when blades are engaged.Again thank you very much.

Is the engine knocking? Without manually cheking oil pressure with a gague, you can only guess.

no knocks.when i had valve cover and started engine oil came out of valve cover housing. Just ran engine 30-40 seconds?

this is good info. going to try it on mine!