Originally Posted by blublapp
An austrian tuner tested this out on the dyno. It's necessary because of the construction form of the original airbox in which the rear cylinder gets more air, so more fuel is needed too.
he sells open airboxes too and gives out this information.
my setup with an ITG filter (same as CPR) is 155/155 mains at present.
I did suspect that the rear larger main has nothing to do with operating temperatures, but its airbox/exhaust related....Thanks!