I noticed here and there 3rd and 4th gear can be a tad bit difficult to shift into. When I say difficult I mean that sometimes there's a little bit of resistance, almost as if it gives a slight "sticky" feeling. Most of the time I don't even notice it, and when I do it's nothing very significant. Just something I picked up on. I've had my bike for two months and I'm not sure when the previous owner changed the tranny fluid, maybe it's time I should? I just don't want the transmission locking up on my one day..