Okay, here's the scenario......clutch gasket and coupling cap and oil pump sprocket replaced at 82k miles. All has been fine and the bike had 97k on it and I was due to get an oil change and final drive change along with new tires before a 800 mile trip last weekend. 97K and I had the work done, left town and all was fine, for the whole 4 days we were on the road. Got back home, parked the bike on Sunday evening. Now the bike has 98K and on Friday I hopped on for a short little ride. Right after startup, shifted into 1st and the bike sort of "lurched" forward. I got out on the highway and felt that shifting was harder than normal and to get into neutral was like a dance.......1st, 2nd, 1st, 2nd, 1st.....you get the idea, and that followed by a decrease in performance when twisting the throttle hard. Now, the bike has had Castrol 10-40 in it since the beginning, and when the last oil change was done, the guys used Motul 10-40. Question is, has anyone experienced this before, after an oil change, just like light switch? It was fine one day, then after the oil change it was working this way. Keep in mind that after it was changed we went on 800 mile trip to Nashville in stop and go traffic and it was Hot! Dang it was hot, and I don't know if that would have had some adverse effect, but please , share some experiences and knowledge, thanks in advance.