Had two very good riders tell me that my 500 wants to lay down on the top end.They said to check my jetting.I dont know anything about jetting it and they were short on time and had to run.any help on how to do it and what jets I should be running? I'm at Elavation 2900 and running 40:1 mix The bike has very low hours and they also said it was very good on the bottom end and midrange power wise.so what do you think?what kinda jets should I be running.also the bike sat for awhile and came out of Calif.thanks for any and all info.