Mf 35 sputters/backfires

[Gary927]

I have a MF35 that saris fine and runs for a little while then stars
sputtering and backfiring as it warmsup and under load running
the brush hog for instance. I changed the plugs, wires and
distributer cap still no change. what should i do next.

 

[harwich cub]

Our 35 was doing the same thing 1st check for spark when it dies. If it has spark check the fuel strainer for a partial blockage causing it to run then starve for fuel.

 

[Phil Tibbetts]

Check the coil. Sounds like it is breaking down when it gets warmed up.

 

[Inno]

I have found similar symptoms when starved for fuel. Try pulling out the choke a bit when it starts and see if it smooths out. If so check your filters/sediment bowl. Every 6 months or so I have to remove the sediment bowl from the tank and clean out debris left behind from the previous owner's attempt to seal the tank with POR 15. It now flakes off and plugs things up.