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Hello, my name is***** will assist you.
Would you please post the serial number of the engine?
Has the engine been sitting for some time?
Have you tested it for spark?
Ok, got it.
First you are going to need to test and see if you are getting spark. This can be done with an adjustable gap spark tester that can be rented from most chain auto parts stores.
Do you have a good quality digital multimeter?
That is not the proper way, but is can be done that way. Use a pair of insulated pliers to hold the wire, and have a helper crank the engine over while you are holding the plug neat the block. See if there is any spark on it.
Sorry for the delay, I had to step away from the computer for a bit.
On the kill switch, unplug the black/yellow wire and try the test for spark again. It is really best if you can be right there at the plug to watch it.