Motorcycle Questions? Ask a Mechanic.
With the problem evolving into more difficulty I worry that there is a problem in the shifter pawl, shifter drum, or shift forks. I believe the shifting problem is coincidental to the service and clutch change. Inspection of these items requires some disassembly and precision measuring. I can help you with this if you want to try it yourself.
I hope this helps. Please let me know if I can be of further assistance. Also, please leave a positive rating for my service today. Thanks, P.J.
The lever arm to which I'm referring is external to the transmission and behind the inner primary. It clamps to a splined shaft on the side of the transmission and sits vertically with a hole at the top where your shift pedal linkage connects.
The pinch bolt of this lever is a common source of shifting problems. Grab the top of this lever and try to move it around. There shouldn't be much, if any, movement. If so, the pinch bolt needs to be removed, the threads lubricated, and the bolt tightened until that movement is gone.
You should also just verify that all your linkage connections are tight. The shifter linkage can contact the engine case and/or inner primary and limit the travel which can cause shifting problems.