on my 400ex when i take off from a dead stop i can feel some shaking or chattering feel. it only does it when the bike is hot and the clutch doesn't slip in the upper gears. i personally don't think it is the clutch becasue i am running a sparks clutch but could it be the stock basket or hub? i guess it is hard to explain. it feels like something is slipping but grabbing. it kind feels shakey like when your in too high of a gear for the conditions. the axle bearings aren't bad so i know that isn't it. any suggestions would be great.

 

What oil are you using? Does it have moly in it?

 

i am currently running the honda oil (regular, not synthetic 10-40)