I disassembled & re-assembled a Briggs and Stratton Intek OHV 18 1/2 HP Engine Model # 31P777, Type 0367E1, Code 050405ZA
I made sure when I re-installed the Camshaft that the dot lined up with the timing gear dot.
The Piston & connecting rod where not touched
Made sure that the push rods are in their correct locations.
After the engine was re-assembled I observed:
Turning flywheel CW by hand where magnet lines up with Coil Magneto, both valves are closed, which makes sense.
Turning flywheel CW by hand one full rotation where magnet lines up again with Coil Magneto, intake valve is open & exhaust valve is closed, which does no look right.
With intake valve open & exhaust valve closed the spark will now cause the engine to backfire.
How is it possible for that to happen?
tinkerer200
pipilusOriginal Author
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