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I have a 20 Hp briggs & stratton motor it will run good for about fifteen minuets the gets hot and shuts off,,I replaced the coil and plugs , still does the same ,, could it be the valves ?
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the wires going to the coils are shutoff wires you can run both to a switch and then a wire from the switch goes to ground when you flip switch it grounds the coils shutting off the motor
Your kill wire from the switch to the coil is bad,disconnected or connections dirty...or switch is bad...try disconnecting the kill wire on the coil and using a jumper ground the coil directly to the engine or frame it should shut down if it does it is the wire or switch do the same at the switch if it shuts down it is the switch..if not the wire has a break..good luck..
Try this locate your coil / magneto and disconnect the kill "shut off wire " and try to start if it starts your switch may be bad or wire broken..if still no spark using a rubber handled pliers ...Pull your plug wire and place a screwdriver or similar metal piece and in the plug wire now bring the screw driver close to the engine block or Frame if spark it is your plug..if not your coil needs replaced...not a hard job just use a business card to set clearance on your coil..good luck
Believe it or not, I had this same thing happening on our L120 John Deere. Turned out to be a plugged gas cap vent! At first I couldn't believe it but i resolved it with my air compressor. Now I always make sure the vent is clean and have had no problems since.
Sounds like the tank is not venting. Try leaving the cap a little loose and see if it stays running. If it does, either the vent for the tank or a vented gas cap is plugged
my mtd lawn mower wont start . when I turn the key there is a buzzing soung where the battery conectors are near the shifter but the starter is hot and getting juice
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