still going?

[John in N.MN]

My 860 continues to chug along for a short while after I turn off the key. If I am saving gas this way I don't mind but it doesn't seem natural. Suggestions?
Non smoking

 

[Anonymous-0]

Check ignition timing.

 

[Brian Allen]

Sounds like it is adjusted too lean on the carburetor.
When the exhaust valves get too hot (red hot) this will cause run-on.
This usually ends in engine failure.
Brian

 

[old]

Well since you just posted it running hot then you probably have 2 problems that are caused by one thing. Cooling system might be clogged, fan belt not tight or radiator need to be washed out. A hot engine will try to keep running when you turn it off because of carbon deposits in the engine that are hot and they cause the gas that is still being sucked into the engine to burn and that keeps the engine running sort of
Hobby farm

 

[Wayne IA]

As Old has said, red hot carbon deposits is the problem. Besides the above mentioned choices for a cure. You could take the head off and remove the carbon, orrrr-- let the engine run at a slow idle for a minute or two, and then turn the key. There are probably some over the counter products(carbon deposit removers)that might help. Never have used them.

 

[teddy52food]

What would the timing have to do with it? When you shut the key off the ign spark is gone! It is still firing from another source.(like hot carbon)

 

[old]

A mist of water into the air in take of the carb will clean carbon out. And or also running a mix of 1qt of ATF to 5 gal. of gas will also help clean out the carbon of both