Searching for the tune on my chopper with the 77 CB750 motor, I'm seeing an interesting phenomena that internet searches aren't explaining. When checking my timing with a timing light, I am getting good readings on 1/4. Timing is spot on at idle and at full advance. When I check 2/3, however, the light is a bit intermittent at idle, then completely goes out at full advance. This suggest the plugs are on 2/3 are not firing at all at full advance. Primary and secondary resistance on the coils checks out just fine and the ignition is static timed. Good power to coils. I am getting fouling on the plugs, so my conclusion is that it's the fouling that is causing this issue. Basically, I am guessing that at full throttle it's flooding the chambers and my really dark, basically fouled plugs are cutting out. But when I let off the throttle, I get light again, so I am not 100% confident my conclusion is correct. Anyone else experience this that may have insight?