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Have you verified that there is good strong spark on all 4 cylinders that will jump a 7/16" gap on a spark tester?
Could you do a compression test?
Ok, let me know on the spark. You can also test the firing of it by using a timing light when it is at 3K rpm. you would just be looking at the light to make sure that it is a good flash and equal on all cylinders.
For the compression, make sure that you have the throttle butterfly open. Being a four stroke, it needs to be open to get the air.
On the coils, how did you test them?
do you know how to do a test on the spark plugs using the multimeter?