Since the thread still appears to have some traction, let me throw some carb tuning thoughts in here.
First, when considering carb tuning, it's kind of like taking a road trip; you can take lots of different routes to get to the same place. Some routes may be more efficient, some may be more fun, some routes seem to go in different directions, but in the end are about the same, time and mileage-wise. Carb tuning is like that; lots of ways to get to where your going.
When carbs are properly tuned, they're running properly at all throttle positions and rpms. Tuning isn't targeted to make one rpm range better at the risk of making another worse, unless you're racing and the lower rpms just don't matter.
Economy and good carburetion generally go together. It's hard to get though. Easy to just jet rich and get good transitions but lose economy. I don't do that with my jetting.
Drilling holes in slides just lets the slides repond more quickly up, but also down. The result can be jumpy slides. I opted to not do that with my kits, as vibration on a connie is always an issue, and I wanted smooth operation.
The foam block - while we've already discussed the tuning flexibility afforded by changing the air rather than changing the jets, the REAL reason for the foam block was to increase the low end and midrange power. Basically the cams / ports for the zg1000 are to big, and there tends to be alot of reversion pulses back through the carbs at lower rpms. This creates multiple carburetion, and lessens available torque because less charge is trapped in the cylinder. Blocking the intake suppresses these pulses and keeps the cylinders filled better.
While some(one) may point to the little sticker on the airbox that says "never let anything obstruct the airbox inlet" and say it's "out of bounds" for me to violate that warning, let me offer this - I have dyno charts of Shoodaben making 117 hp with 1/2 of the airbox intake blocked. The point is that a stock connie, in the 89 hp range, will never be air starved by blocking the intake as the 2 minute mod jet kit does.
And Azbike, I agree, the FP kits are superior to the DJ kits. I run FP needles in my 36's. The 32's (zg1000 carbs) work great with the stock needles, perfect for power and economy due to the multiple tapers, which are pretty much unheard of in the aftermarket. HTH, Steve