since ive last changed the oil, about 10 hours riding time has been put on it.well i decided to check it today, it was down to the bottom line!! i checked it cold and cant find the manual right now. does it move up once it gets warmed up? its not smoking and it runs great. i know i need to check it more often. when i change the oil i just put in what the manual says to. am i panicing for nothing or is this just normal useage? thanks for youre help...