Id say you most likely have spark because of the fact you shotgun fire after cranking. The CDI will pull power threw the coil to charge and then open, this causes the collapse in the field and the spark to fire 1&4 2&3 fire at the same time, one on compression the other on exhaust (waste spark). On a waste spark system you are witnessing a loaded cylinder and exhaust with fuel vapor, the exhaust valve open, and after a pause of cranking and key on the CDI opens the circuit, field collapsed, vapor ignites and you get that lovely shotgun sound (loud).
Good cheap test equipment like a injector noid light across the coil terminals will blink while cranking. This will show you have a drive signal to the coils. Next would be to check spark at the plugs, another cheap tool like the the thexton spark gap tester is a good thing to have.
I'd say over fueling problem, flooding or its one coil down. Pull all your plugs see if they are all wet or just some.
Good cheap test equipment like a injector noid light across the coil terminals will blink while cranking. This will show you have a drive signal to the coils. Next would be to check spark at the plugs, another cheap tool like the the thexton spark gap tester is a good thing to have.
I'd say over fueling problem, flooding or its one coil down. Pull all your plugs see if they are all wet or just some.
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