hey guys! having a problem with my M dieseling when you shut it off and having to put it in 5th gear right away to kill it other wise it will diesel when it shuts off and keep running.. it will only do it when its warm, it never gets warmer then 190 degrees and ussually runs a little less then that.. i dont have a problem with it when its just sitting idling for a while or if i use it to move something in the yard with it.. im running straight 110 octane that i get from a local race shop, i put the tractor in 5th gear before i hit the kill switch and let the clutch out easy as i hit the kill switch and then it wont diesel. anything i can do?? run a different fuel? ive mixed in for every 5 gallons of 110 i use like 2 and 1/2 gallons of 93 to make the fuel last longer as the 110 isnt very cheap