engine run on

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

It's called dieseling.

That means there is some fuel and some air still getting into the cylinder, and it is being ignited by something hot, which is usually a carbon deposit.

Sometimes this is caused by the idle speed being set too high, which opens the throttle blade enough to allow enough air slipping by to pull fuel from the idle or more often the off idle transfer slot.

My suggestion is to check your idle speed and mixture. If you have the idle set too lean, you have to compensate with more throttle. You might want to slightly richen the idle mixture so you can close the throttle a bit more to prevent fuel pullover when shutting down.
check your timing too.

Users who are viewing this thread

Top Bottom