Hi Guys,
My 4hp Tecumseh (on a Troy-Bilt Junior rototiller) backfired when running at full speed and real bad when the throttle was pulled back to idle.
After searching the web for a cause of backfiring on small air cooled engines, I couldn't find a definitive reason why.
I removed the head on the engine and did replace the rings and shaft seals. I'm guessing carbon buildup on the piston, cylinder head and around the valves was causing a glow plug like firing of the air/gas mixture when the intake valve was open (instead of firing when the spark plug ignited it). Once the carbon was removed with a wire brush the engine doesn't backfire anymore. So I'm posting this for future reference.
Any thoughts?
Jeff
My 4hp Tecumseh (on a Troy-Bilt Junior rototiller) backfired when running at full speed and real bad when the throttle was pulled back to idle.
After searching the web for a cause of backfiring on small air cooled engines, I couldn't find a definitive reason why.
I removed the head on the engine and did replace the rings and shaft seals. I'm guessing carbon buildup on the piston, cylinder head and around the valves was causing a glow plug like firing of the air/gas mixture when the intake valve was open (instead of firing when the spark plug ignited it). Once the carbon was removed with a wire brush the engine doesn't backfire anymore. So I'm posting this for future reference.
Any thoughts?
Jeff