The VFR engine management system is nowhere near as sophisticated as modern autos, Honda’s system would be much more akin to the FZ1 (minus VTEC of course), that’s pretty bare-bones-basic by auto standards. I'm taking a decent guess that if the FZ1 ECU needs RPM data for fuel cut-off, so would the VFR's ECU.
The last time I synced the SV’s was two years ago and I did get them nice and even at idle, but I seem to recall they did not run even off idle. Maybe I should try and sync the SV’s with PAIR enabled and off idle too.
Did you try syncing the SV’s with PAIR disabled as per the manual to see if it made things better or worse?
I have confirmed that the SV’s can go out of sync easily and it takes many km's before they “settle down”.
No I did not ride the bike with the pair disabled and the starter valves synced. It makes no sense.
First the book tells you to set the RPM to 1200. Then it says block off the pair and sync them. All ok but now if you unblock the pair the RPM's rise to about 1500 and the valves are no longer in sync. So the book says bring the idle back now to 1200. If you do that the valves are way out of sync.
I tied that and thought this is stupid they want you to run with the pair system on so why not just sync them with the pair on, now you can adjust the idle to what you like, balance the starter valves and you know when you put it back together exactly what idle speed you will end up with, if you need to adjust the idle with it all together the balance will be out. Try it, adjust the starter valves and the change the idle and they will go out. What I am saying is the idle you have before putting it together is the idle you want to end up with, if you change it the balance will be out. Blip the throttle a few times and keep fine tuning and you can get them dam close.
I think thats why when guys have synced the starter valves (the "Honda" way) they are saying it runs great when they block off the pair! It will because the valves have been synced without the pair in the first place so now they are in sync again.