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Old Aug 20, 2008 | 12:25 PM
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Default Bike "diesels"
Can anyone tell me what the cause of "dieseling" is on my 97 Softail Custom? It only does it now and then but the motor will actually run backwards after killing it with the run switch.

Thanks for your input in advance!
 
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Old Aug 20, 2008 | 12:33 PM
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1. Intake leaks
2. Idle too fast
3. Engine runs too hot
4. Bad fuel
5. Carbon build up on valves
6. Bad plugs
7. Carburetor leaks
 
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Old Aug 20, 2008 | 07:07 PM
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Detonation/pinging creating hot spots leading to the dieseling. Also can be caused by carbon deposits getting hot as said above. It is residual fuel buring after the ignition shuts down.

Some say that Seafoam is good on carbon deposits. I know that it will cause your bike to smoke like a son of a gun until it is burned off.
 
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Old Aug 20, 2008 | 08:38 PM
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Ditto what's said above. Good idea to address it if it becomes more than a now and then thing.
 
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Old Aug 22, 2008 | 10:21 PM
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Switch do a better gas or hi test 1st.
 
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Old Sep 14, 2008 | 11:02 AM
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is it bad on a engine for it to diesel?
 
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Old Sep 14, 2008 | 11:52 PM
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Timing too far advanced, fuel / air mixture too lean, low octane fuel are all causes of dieseling.
 
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