Posted by Bob M on May 21, 2012 at 18:47:06 from (74.67.189.51):
In Reply to: 450 gas posted by metalmender on May 21, 2012 at 15:21:25:
Definitely is NOT ignition timing. (Once you turn off the switch there is no ignition, hence there can be no "timing")
Most likely a combination of things others have pointed out: Hot plugs, glowing carbon deposits, hot engine, low octane gas, etc. Excessive compression (LPG head) can contribute too.
Stuff you can do to minimize dieseling the future:
- Set the slow idle RPM as slow as possible (400 RPM or less for a 450)
- Adjust the carb idle mixture for smooth idle then reset it a quarter turn or so rich.
- Use cooler plugs (Champion D-17 or other mfr's heat range equivalent).
- After working the engine hard, let it run at slow idle 5 minutes or so to cool before hitting the switch. Or simply close the fuel shutoff at the sediment bulb and let carburetor run out of gas (don't forget to turn off the ignition afterward however!)
- When shutting down, put the transmission in road gear and hold the brake. With the engine at slow idle gradually let the clutch out until the engine just starts to pick up the load then shut off the ignition. The engine WILL stop immediately!
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