Leaderboard

I was having a similar problem with my mule 610 and reading the posts. My Mule would foul the plug after about a half hour or so. Changed out a lot of parts and spent a lot of time troubleshooting. In the end it ended up being the fuel line. The rubber on the inside of the fuel line was degrading and small particles would hold the needle valve slightly open and flood the motor and foul the plug. I changed the fuel line to a PVC fuel rated line and it’s been working great sense.