Ok trying to get a handle on my jetting for my 03 wr450. Went to manual for base numbers and it has my main listed as a 150. Cant find anyone in the jetting section with this low of number. Have not had it apart to verify, just a misprint?? Also thought I read somewhere on here that if you activate your hot start lever while riding and it acts like a throttle you have some jetting issues? Bike runs OK but I do get the occasional startup backfire and the surge at steady throttle.