I have re-lapped the valves, I have replaced the spark plug & fuel filter, I have replaced the needle and bowl gasket & I have flushed out the gas tank and used Hi Octane fuel. My problem is that when I turn off the ignition key, there is a Pop / Backfire thru the muffler. I have connected the two wires that go to the fuel solenoid. Everything seems to be okay. It starts easy and runs good except when I turn the ignition key to the Off position is when the engine makes a Popping Noise.
Any suggestions ?