All seems quite good with one exception:
Between 1.8K and 2.5K RPM I experience a snatch-like condition, as if ignition comes in and out in some of the cylinders. Misfire like, not sure how else to describe it.
The idle is perfect, and again, anything over 2.5K RPM is also perfect (really
). Also, the wider the throttle opening, within the above range, the more intense the effect, always disappearing above 2.5K RPM.
What I know:
1. My carbs have just been rebuilt, courtesy of a lot of help from the Forum, including removal of the idle jets etc, etc, etc
2. The acceleration pumps works well on all 6 carbs
3. The bike works well otherwise, plenty of power, really nice over 2.5K
4. I have used the original ignition system, original coils, original plug caps but new HT cables and new iridium tipped plugs
What I DONT know:
1. Which is the point one of the 3 HT circuits is more likely to short?
2. Is the off idle transition under load a situation which would encourage a marginal coil / HT circuit to short or temporarily fail to deliver a spark?
Thanks in advance for any help!
Aris
) and report back.
.
. Now I know, and you know, this is far from a true simulation of a bike under load, but this is what I found. Only explanation I could think of is that under the specific circumstances the plugs are at their hardest to fire (why, too rich? too lean?), so the spark chooses the easiest way to ground, through the compromised coil pin hole. As a side, I dread the thought that this little bit of sparking was taking place below and close to the fuel tank 
.