Well I finally got Guzzidiag to load and recognise the ports on the old Windows computer. Then got hooked up and checked the TPS - it was at 4.6 deg. Then checked all the screws on the throttle bodies and the ends of the linkages etc and all the painted ones were still painted and intact with the exception of the high speed adjust screw on the linkage on the left body and the two air bleeds. After this I reset the TPS and it went to 4.8 and I cleared the learning parameters.
To make it easier to get at the left hand bleed screw, I took off the starter motor cover. Needless to say one of the little dome head Allen screws socket stripped, so I had to use a stud removing socket to get it out, but after that no problem. Must have been done up by Guy the Gorilla.
I then checked the air bleed screws with a view to shutting them. Both were open to some degree, so I closed both. That was tricker than it should be because of the location. Then hooked up my ancient mercury powered Motion Pro vacuum gauges and after the first run, remembered to move the breather hose on the back of the
motion Pro to the open position; thus improving the stability and accuracy by a significant degree! Ran the bike up to 3500-4000 rpm and held it there at a reasonably constant 3800 speed, with a G clamp on the throttle and then balanced off the mercury columns using the speed adjust screw.
Removed the G clamp and let the throttle snap back. TPS was now 5.2 and then re-sett the TPS again (back to 4.8)and cleared the learning parameters. Finally, adjusted the slow running balance using the air screw on the right hand carb as it was higher. On the tick-over part of this the mercury was bouncing about a bit, but both appeared to be level, or operating in the same range, so I called it a day.
End result is that the tick over is around 1200 and not too lumpy. (It got smoother once I took off the carb sticks and re-connected the vacuums.) Cant tell about the over run as it was P-ssing down outside the garage so that will have to wait for another day.
All in all a successful mission and I now understand how the throttle bodies work and the logic behind the tunic sequence.
One question - If the stepper motor basically controls the slow running sequence via the computer, is it not possible that the pipework, or the stepper motor gets full of sh1t and so needs occasional cleaning? (Not letting go of this one quite yet!)
Many thanks for the help and instruction Pete, - Anyway; I enjoyed it!
Malcolm.