ok so i got a 400EX with a 440 big bore kit with a recent top end issue tore down the top end and fixed it then put it back together now it’s leaking oil from were the piston hits the valve now it looks like it coming from the top of the cam chain tensoner but it about a inch above that and coming dow how is that possible maybe a bent dowel pin its coming fom the right side of the motor idk i need help plz i will add a picture and recently every time i get on a hill it leak on the overfill line on the carb i cleaned carb any other suggetion but i recently changed the main jet but it didnt leak until i noticed i dumped dirty gas in does that mean the floats are still dirty