Briggs and Statton OHV engines require periodic valve lash adjustment. 0.006" for both exhaust and intake is sufficient.
SOURCE: Yard Machine 20HP TWIN runs but when you take off choke it Dies!
remove carb and clean the main fueljet
it is gummed up due to set to long with
gas in it.
SOURCE: 27 hp kohler v-twin ohv backfires, and @
SOUNDS LIKE IT HAS BAD GAS AND THE VALVES NEED RE SET YOU MAY WANT TO FLUSH YOUR FULE AND CLEAN OUT THE CARB LET ME KNOW IF THIS HELPS
SOURCE: we have 42'' Yard Man riding lawn mower need to how to change oil
it's a square head pipe plug @ base of eng. either right or left side of machine may also have a quik change fitting instead its black plastic w/ yellow cap
Testimonial: "Thanks for the info, you where right on the money.. I finally found it, its on the right side if you were sitting on mower. Thanks again!"
SOURCE: Why won'y my 20hp Craftsman Yard Machine riding mower start?
when changing the belt you might have knocked off a wire to a safety switch
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