Same for my 345. When I'm done working it, I throttle back to 1/2 and head for the barn. About the time I get there, it's mostly cooled off, and then I bring it to idle for about 10 seconds once I'm inside. Only then do I switch it off. That's made it quit.my 318 will backfire out of the exhaust If I don't idle it down first.
LOL! :thanku:Nope....Whats saleen49 is trying to say is "when you shut off the keyswitch,you kill the spark,but the motor is revolving at a high/low speed,still sucking in gas fumes and fumes from the crankcase....so depending how the momentum(sp) stops(which stroke the piston and valves are at ) the raw fuel that has built up in the engine cylinder/muffler is now ignited by the hot exhaust ....causing a back fire)
This is as clear as mud isn't it???? ...Jim ....
Its quit possibly just the nature of the beast. You have a simple carburated small engine with a hot muffler. You shut the motor down while everything is saturated with heat, and raw fuel makes its way to the cherry red exhaust and explodes. Like others have said, try taking a slowdown before you turn the motor off.Thanks JimC Vt, That makes perfect sense as far as what happens but how do I make it stop and what is the the term "too rich" mean when talking about the fuel? Is it an adjustment that can be mad in the carb or something like that?