Today I re-balanced the throttle bodies on my 1200 Breva, using the excellent how-to's posted here.
Closed air bleed screw, attached manometer, adjusted the fast speed screw to balance at 3000 rpm, then adjusted the idle by opening the air bleed screw. So far so good, but if I then take it to 3000 rpm again the balance is now out because of the extra air coming in on one cylinder via the open bleed screw!
It seems to me that it's back-to-front. Balance the idle first, then do the high speed which will balance allowing for the extra air via the open bleed screw.
Am I missing something here? Where am I wrong in my reasoning?
Closed air bleed screw, attached manometer, adjusted the fast speed screw to balance at 3000 rpm, then adjusted the idle by opening the air bleed screw. So far so good, but if I then take it to 3000 rpm again the balance is now out because of the extra air coming in on one cylinder via the open bleed screw!
It seems to me that it's back-to-front. Balance the idle first, then do the high speed which will balance allowing for the extra air via the open bleed screw.
Am I missing something here? Where am I wrong in my reasoning?