If a 9-horsepower Kawasaki engine is backfiring under load, you might need to clean or replace the air filter. The timing coil could be damaged as well.
Out of time or spark plug wires incorrectly installed.
Black smoke is caused by too much fuel going into the engine. (often seen when running under load) If the engine smokes with little load and is worse at high RPM, it could be a plugged air filter. I have seen a Cat 3208 cat backfire and smoke as a result of a plugged air filter. The backfire only occured after the engine had reached operating temperature. I believe there was not enough air availiable to burn the fuel. This resulted in a loss of power, which opened the throttle even more. As a result, the unburned fuel was probably igniting prematurely on the next compression stroke causing the engine to run very poorly and backfire. After replacing fuel filters and checking for air leaks in the fuel supply with no success, replacing the air filter solved the problem.
when it is under load it means that more and more is being demanded from the engine, be it from speeding up or turning on all auxillaries
Ping under acceleration or under load.
It forces air under pressure into the cylinder increasing the torque output of the engine when under a load.
Engine Position Sensor.
yes because load affect the efficiency of engine , it can be improved by increasing the supply of oil in governer.
Sounds like you need the clutch adjusted or replaced .
Usually it is related to fuel since the engine consumes more when worked(under load.)
From my unfortunate experience and the amount of information I gathered on the subject, two sources of faults can make your engine cut out under load (I assume it is not a diesel engine): ignition or fueling. Ignition: if the spark is "weak", it will be smothered when the engine is under load, giving poor or no combustion. Main reason for this would be bad High Tension leads or ignition coil primarily, or too big a gap in spark plugs. Fueling: A clogged filter or an ageing/dying fuel pump would allow the engine to idle or rev freely under no load, but as soon as you are asking for some power from the engine it would just die. In both cases, the engine may seem to be running perfectly OK when not under load. Hope this helps.
An engine may "shoot" or backfire under load due to a variety of factors, including improper air-fuel mixture, ignition timing issues, or exhaust system leaks. When the mixture is too rich or too lean, it can lead to incomplete combustion, resulting in unburned fuel igniting in the exhaust system. Additionally, a malfunctioning ignition system can cause misfires, contributing to backfiring. Maintaining proper engine tuning and addressing any mechanical issues can help mitigate this problem.
Check your alternator, it will cause the engine to miss if it is not putting out enough voltage under a load.