I have a Cub Cadet Lawn Tractor with a Briggs and Stratton 18.5hp OHV engine, model number 31Q777 0305 E1 that has no spark. I have tried 3 different magnetos, the original, one from a tractor that I knew worked and a brand new one. Still no spark. I disconnected the kill wire while trying the second magneto and haven't connected it back up. The engine cranks over with no problems with the key and when I jump it straight from the starter, but I cannot get a spark. I have also checked to make sure the flywheel pin was not sheered and cleaned the flywheel magnet. I am at a loss. Can anyone help in determine why I can't get a spark?
No Spark On Briggs
- Thread starter raider820
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How did you verify no spark?
Tinkerer200
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Yeah, how? Just for the record, a sheared flywheel key will have no affect on whether it has spark, only affect if it is at the right time. (Unless it is a 1980 or older engine) Also, concern with corrosion, dirty, is only with the coil mounting surfaces.
Walt Conner
I used a spark tester and then tried with my finger.
do this simple test, unplug the main plug to engine and then see if you have spark, if you do then its a safety switch somewhere killing it
its very common for the seat switch plug to back off a little and there is a spring wire in it that kills the mower thinking the switch is unplugged
note - if its still plugged in and the engine starts you need to plug it back in to kill it
its very common for the seat switch plug to back off a little and there is a spring wire in it that kills the mower thinking the switch is unplugged
note - if its still plugged in and the engine starts you need to plug it back in to kill it