Hi all, straight to the point: occasionally I'll be under moderate acceleration and find that when shifting up I get *full* travel of the shifter but the bike doesn't change gear. It's not a false neutral as I still have power in the gear I was in, it just doesn't change up until a second attempt at moving the gearshift. It usually does this in the moderate to higher rev range (north of ~8,000rpm) in 3rd, 4th or to 5th The bike is a 2002 Kawasaki ZZR-250 with ~21,000km in what I believe to be good mechanical condition as it starts and runs beautifully usually. Would it be some form of wear/damage to elements in the transmission and, if so, is this something serviceable on my lonesome or better left to the skilled? Thanks in advance for anyone that can bothered reading this and having a think about it!