Hmmm, well... the calculator will get you close enough that plug color will be meaningless. In other words, the plugs will reflect a mix of riding conditions (including deceleration) that should produce a color within the normal window. The plugs will only look bad (after using the calculator) if you have defective carb circuits or faulty combustion seals (rings/valves/etc.). Idle mixture and balance won't change as a result of resizing the mains, so don't worry about that. Final tuning can be done with a dyno if you're horsepower hungry, but for many purposes, the calculator will be so close, it won't matter. I went to 125s after installing TORS, based on the calculator. The difference in the exhaust note was immediately apparent; not so dry and sharp after the change. There was also improvement in 5th gear WOT acceleration on the highway. No other changes or adjustments were necessary until several months later (last weekend). Because of the colder weather, the bike developed a lower-midrange flat spot that persisted every morning until I was nearly all the way to work (1/2 hour or so). I backed out the idle screws one turn each and the problem has been resolved.
