I use Honda full synthetic and it made a huge difference. Shifts better, and no more valve chatter. I am thinking maybe the outside temperature has something to do with the first to second gear problem. Because I adjusted the clutch late summer when the temps were in the 90s. I didn't have a problem shifting until hunting this fall when the temp dropped to the 40s to 50s. I am going to adjust it tomorrow cold and see if it shifts correctly. If it does a winter and summer clutch adjustment might solve the problem... Can't hurt to try!