I recently had my engine out so saw it as a good opportunity to replace my clutch plates and chain guide. Apart from checking and re-torquing the nuts on the end plate I didn't touch anything else. Put everything back together (as per the manual), took the bike for a run and found I was unable to engage fourth gear (gears 1-3 no problem and no strange noises from the engine/gearbox). My immediate thought was something cable related but having removed the cables and trying to operate the gears by the tie rod the problem persists. It literally feels like I only have three gears. Before I crack the engine open again I wondered if anyone had any thoughts on what the problem might be/what I've missed.
Thanks