I just switched to blue after many years on a CRF450. I'm looking to clean up the bottom response on my new 07 YZ450F. I'm installing a R&D power bowl today and would like to address all the carb issues at once. All jetting and exhaust is stock. Fuel screw is 1 1/2 out. I race MX and all the tracks are at sea level. It's hot in the Northeast, 95 yesterday but most weekends are around 85-90. The R&D has the adjustable leak jet and a different spring for the AP instead of the oring fix. All advise is welcome as the Yamaha is new to me. Thanks...Doug I tried the jetting forum without any luck.