Engine LX277 Mower engine surging

[prowler]

Please post engine model numbers.

The engine is an air cooled, Kawasaki FH500V, 494cc, 17HP VTwin OHV.

 

[prowler]

I am still suspecting fuel pump or pulse line. Please post engine model numbers.

The fuel pump was already replaced.

 

[Rivets]

If you can find no air leaks, I would take a look at your valve clearances. They may be to tight, where when the engine gets hot the valves expand and stay open too long.