Posted by Crazy Horse on August 21, 2015 at 06:43:31 from (66.222.185.114):
I'm not getting any spark from the ignition system on a Briggs and Stratton pull-start air cooled engine (on a Coleman generator set), about 15-20 years old. The on-off switch (which is really just a ground switch) is working, I tested it separately. I did some testing and the wire which goes to the ground switch (from the transformer magnet mounted above the flywheel) is continuous to ground when disconnected from the ground switch. Obviously, it should not be grounded if I am expecting the plug to fire. When that wire wire is connected to the ground switch and the switch is in the on or off position, that wire is grounded so no spark.
But I never did test the wire to see if it is grounded all the time when the flywheel is spinning. Maybe when the spark impulse occurs, the wire is not grounded if the switch is in the on position? I'm not sure how these things work. This happened all of a sudden, actually the tractor fired for a few seconds before the ignition went dead.
And I had just previous to all of this bypassed the diaphragm style fuel pump which feeds fuel to the carb float bowl. Since the fuel tank is well above the carburetor, I just use gravity feed. I don't think that this could have any connection to the lack of spark unless there is some mystery bit of engineering in there that is hidden away from me.
Any suggestions about this and some possible further trouble shooting or checking is appreciated.
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