Originally Posted by ChefK
just joined the forum. I would appreciate any feedback on the following please:
Purchased a 2007 Mule KAF400A - 4 stroke/OHV/1cyl air cooled engine with very light usage. I use it for general gardening and property work on 4 acres. Have had it for 2 years and religiously perform basic annual maintenance - spark plug, fuel filter, air filter, oil/filter. Now with 172 hrs.
Just pulled last year's plug and noticed black soot (not oil) on the electrode end. I understand this can be result of lean mixture ( no, rich mixture ), dirty air filter yes, and/or low speed driving ( yes ). Air filter check was fine. I don't run it with choke closed - just to start on colder mornings. I do only run it mostly at low speeds around the property all year.
Engine stumbles and stalls when engaging F or R at startup, but seems to settle down. Once new plug is installed - she runs like brand new.
My guess is not to worry about it - just R/R the plug each year?
Thanks in advance,
I wouldn't worry about it yet. You mentioned that you run it at mostly low speeds, and that may never get the plug clean. Suggestion: run it a little hard every now and then...will clean the plug up a bit unless something is wrong.
See in red above.