i have an 06 AC 650 V2. All i ever do is change the regular oil and differential oil. is there anything else i should lube/oil? thanks.

 

Maybe once a year re-pack your wheel bearings and replace the seals, that is what I do. I start in the late winter, early spring time and just go through the whole bike, check shock and A-arm bushings, ball joints, change differential oil, valve adjustment, wheel and steering bearings clean the oil strainer (need to remove the skid plate for that) etc etc.... If I find anything starting to wear I replace it. It usually cost me less than $50.00 to end up with basically a new bike.