filling radiator on panigale
My method FWIW:
Take off the side fairing.
use a Dremel tool with a round burr.
grind a 1/4" hole in the nose fairing lip right over the filler cap,
keeping enough away from the edge of the lip so it doesn't crack.
filler cap can be removed with a little bit of bending of the fairing, but not bad.
now you can run a 1/4" x 12'' long poly tube scrounged from somewhere down into the tank without difficulty as it is a pretty straight shot.
get a 50-60cc syringe, Toomey, Amazon, and suck up some coolant and squirt it into the tank. or use a small funnel connected to the tube
fill until it runs out the overflow, commonly about 100-150cc above perfect level.
when you run the bike the first time, the coolant expands, goes out the overflow tube, and when it cools, it is at the perfect level. the next time you run the bike, the coolant expands but only to the point of about to run out again.
When I ran the 1199s on the street, I checked it every 500 miles or so, and it never seemed to loose much. Now it is a track bike only and I check it after each track day.