Timing Induced Backfire
One type of backfire that occurs in a 23 HP Kawasaki engine is caused by improper ignition timing. The combustion cylinder’s fuel intake valve opens to take in a fuel/air mixture from the carburetor. The ignition timing is off, resulting in engagement of the spark plug before the intake valve closes, igniting all the fuel in the cylinder, as well as all the fuel in the manifold leading down from the carburetor. This causes a loud bang and pop, like a loud engine hiccup.
Carburetor Induced Backfire
Another type of backfire that can occur in a 23 HP Kawasaki engine is caused by having a poorly tuned carburetor. If the carburetor isn’t working properly, it can get the mixture of fuel and air in the incorrect ratio. Sometimes, too much fuel is delivered to the combustion cylinders for a given amount of air.