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610 mule spark plug fouls after short use


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2007 Mule 610,  owned for 8 yrs and valves were ticking when I got it and had them adjusted twice and this is when plugs began to foul.  I replaced battery (used battery I had on hand) a yr ago and didn't foul a plug for some time and replaced batter (new) with a bigger lawn mower type battery again a month ago and have fouled two plug since.  Had carb cleaned and valves adjusted and still fouls plugs way to often.  Friend has a mule just like mine and his does same thing. Have read this is a common problem with 610 mule.  Any help or suggestions would be welcomed.  Thanks and stay healthy.

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I couldn't find the NGK spark plug number used, but it seems like a lot of people recomnend using a colder spark plug in them than the factory plug. It sounds like the heat rating is too high

When the heat rating is too high:

The spark plug temperature remains too low and causes deposits to build up on the firing end; the deposits offer an electrical leakage path that gives rise to loss of sparks.

https://www.ngk.com.au/technical_info/heat-range/

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Did you mean colder plug? Some say to use hotter so I'm confused. Before the new battery the plug would be really black and sutted up. Now with newer battery the fouled plugs are white that I think  indicates it is maybe to hot. Thanks for responding.

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