I just thought I'd do myself a favor, instead of drilling my pilot jet I decided to get a 55 from the local dealer. WOW! The first parts guy said "we don't sell non standard jets without a special order". "You shouldn't be messing with that"! If your bike isn't running right, you should call the guy you got the air filter from because there is probably something wrong with it". Next place I called I asked for a pilot jet for a keihnen carb, xr650l 42.5 (and said "it's an '07 xr650l if I have the carb size wrong"...just in case.She said "they only come in 80 to 158". I said no it's the pilot, not the main and she said thats the only jet they carry so my carb might not need a pilot. wow is all I can say... Not to mention dealers but if I was ever to drive in Hollywood..... I wouldn't go to ANY dealers.