hey guys i need some help i have a 98 mojave 250 has newer piston and rings. i was riding it the other day and it was running flawless no issues at all and i went up a steep hill and at the top of the hill it acted kinda funny like hesitant and i stopped and then it seemed to run fine when i turned around and got to the bottom of the hill it was cutting up really bad and then it just died and i couldnt get it to run again...I have no idea what is going on with it anu help would be apprciated thanks!