Pat or any other carb Guru: I have the same similar problem ,I know one cyl.is burning richer than the other. I've read some posts somewhere that one could balance F/A (pilot screws) that way(Like Pat described) The feedback wasn't good for that post or something about stressing the other cylinder with the other coil wire off.At this point I could care less about their views I'll tell you what if it has your endorsement I'm going to do that too!You've had more hands on,then I'll ever have.Already Mercury balanced the carbs,Had a little trouble trying to get them dead nuts in fact I couldn't.I switched lines over 6 times.One was always up 1/8" over the other. I tried right,I tried Left and back around. Was trying to be careful,a little fearful of that mercury ,it started getting hot,blued my pipes a bit, the RPM"s crept up on me during the procedure ,caught me unaware(close-2800) I was trying to watch both instruments,Had panic attack;was waiting for mercury to come flying out of exhaust,promptly took it down to a safe level ,anyway I'm working on getting it Dyno'd , not so easy to find around these parts ,For people(Business) that of which are willing to 'run'-dyno a Triumph that is, they claim different connection? However, if you say doing what is described above(pilot screws) is going to get me closer to the ballpark, then great! My settings are as follows ,are 40's large enough?
Pilot screw adjustment:
Start the bike with one side plug wire pulled with idle about 1100-12oo rpm. Adjust the side running pilot screw in until it starts to stumble, then back it out until it starts to rev a bit higher. Set it in the middle of these two points. Shut down bike and then do the same with the other side and then the carbs will be tuned the same at idle...OR THIS.....With the engine warmed up fully, start on one side and adjust the mixture for best idle speed.
Any time the idle speed gets much over 1100 RPM, adjust the idle speed control to get it back to just below 1000. If you let the idle speed get too high, it will start pulling fuel from the transition jets and that will confuse your adjustment. When you have optimized the idle speed, in hot weather, richen the mixture 1/8 to 1/4 turn so the engine will run a little cooler.
Once that cylinder is done, readjust the idle speed and do the same on the other cylinder.
Follow up by rechecking the balance and adjust as needed.
If you have added a balance hose between the manifolds, be sure to remove it and cap the fittings before you try to adjust the idle mixture or you will end up with your head hurting.
...Note: last night when riding w/wife we noticed a faint smell of gas coming to a stop at idle speed.Does this then qualify for the masking tape on the throttle "witness" mark procedure?
