while running? bad spark plug or lean fuel mixture,from day one my troy built pops a little when not under a load, they are set lean at factory and ethanol gas makes them even leaner, if it is backfireing and not starting, it could also be a bad plug, faulty ignition component or a stuck valve
Incorrect Timing Can Cause Backfire.
To replace a Toro 5hp engine on a snowblower, first ensure the machine is disconnected from any power source. Remove the snowblower's hood and any covers to access the engine, then disconnect the throttle, fuel lines, and electrical connections. Unscrew the engine mounting bolts and lift out the old engine. Place the new engine in position, secure it with the mounting bolts, and reconnect all components before testing the snowblower.
The correct ratio for that particular snowblower engine is 50 parts fuel to 1 part two-stroke engine oil.
what is making my Lincoln ls v8 backfire under the engine
A flame arrestor. This prevents a backfire from igniting gasoline vapors in the engine compartment.
About 6.5
NO! It is too heavy an oil for the conditions the snowblower will operate under. Use 5w30 and do not use 5w40 unless you want to damage the engine.
Several things could make a carburetor backfire. The engine could be out of time. the carburetor could have a stuck float, or the engine could have a stuck valve.
No, backfire is usually caused by park plug wires that are installed incorrectly or an engine that is out of time. Fuel filter and pump will not cause backfire.
Engine Timing, Unburnt Fuel
Its between 5 to 6.5 hp.
12 hp