in the months ive been working on my ski ive learned a lot about them. ur looking at a bad ignition box or magneto. theres really no way to test the ignition box other than putting it on a known good magneto. however if u buy a manual for your jetski. they have procedures in it to test ur main coil and trigger coil. if its a 650 they are somehow built in together but they have a procedure for that too. (this is how i learned that i cant mate my 440 box with my 650; i bought a bad attitude cdi box.)
also its bad for the cdi boxes to crank the engine over without having the wires grounded. always have a spark checker on the sparkplug wires when cranking the engine with the spark plugs out or plug wires off
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