Thanks for that Jerry, I got another one whilst I got ya here. I've been reading up in the manual for my 07 and it says to use SYN3 Synthetic lube in the primary. it also says to check the level and add if required but doesn't say were the level should be or how to check it other then the bike be upright and at operating temp. Am I correct in saying that 20w50 motor oil is commonly used in the primary.
There is no simple method to check the primary fluid level like with the motor oil and transmission, which have dipsticks. And checking the primary level is normally only done when you change the fluids. But the best way to check it is with the bike sitting upright and level, remove the clutch inspection cover (derby cover), and the fluid should just touch the bottom of the clutch. Never overfill, as that can cause clutch drag.
As for the fluid, you can use one of the motor oils that claim to be OK for all three holes, like SYN-3 / Mobil 1 V-Twin / Amsoil V-Twin, or something like Formula + and similar basic gear oils. Just make sure whatever you use is fully compatible with a wet clutch. Some of us even run automatic transmission fluid, but that's a subject for another day. If you prefer to limit the number of different products you have to buy and store, I'd use the motor oil for the engine and the primary, and then a real gear lube for the trans.
JMHO -Jerry