This is my first post and my first 4 stroke ,so please excuse my ignorance. I have a few questions about routine maintanance.The bike is a 2002 426 that I got without the manual, so I just need some basics till I get it. 1) how often do I change the oil? filter? 2)how should the dipstick read?(between hash marks when cold?) 3)the pipe is a thunder ally but the jetting is stock. I live in so. cal and only ride tracks. Change jetting? 4)anything I need to lookout for, that a life long 2-smoker might not recognize right away? Thanks for your help!