I have bought rebuilded engine for my GSX1100E. Clutch basked assembly was missing so i bolted up mine. When i fired up bike for carb synchronizing there were no problems. When i wanted to test gearbox (on table with wheel raised) i noticed it jumped in gear. Ok maybe it was in first gear allready, im not sure. Turned of bike, found netural with no problem. Started over and here somes sound from gearbox like it will jump in gear by its own.
Engine was rebuilded by professional mechanic. Only thing i did was to tighten clutch basket nut (30mm). I admit i used dewalt cordless that could do 200nm (20kg) torqu and then secured it with washer. So this is the only thing that i did that has somekind connection with transmission. That nut should have 5-7kg torque. Could it be that i over tighten that nut and now whole shaft is beeing under too much tension??