Sammytom

I will try to keep this short but detailed if thats posable. I need some help. My problem is that im getting half as many sparks out of the leading L2 coil than the leading L1 coil. And the kicker is when I rev the motor past 2 grand it seem to cut out completely. I have done the following.
1. Replaced plugs and wires
2. Switched the wires from L2 to L1 and the L2
still had half the spark.
3. Temporally replaced the coils with a freinds.
Still no change.
4. I upgraded the ground.
5. Checked the coils with a ohm meter.
check out fine.
If you are wonder my method of testing,it is with a timeing light. I talk with a friend who owns a shop and he says that the leading coil recieve one signal and that it is split up in the coil to L1 and L2. He said because they both fire at the same time. But what I dont understand is if it recives only one signal, than how does one of them work but not the other. Though all the things I did, I belive that I narrowed it down to something before the coil. Please help! Im at a dead end!