DROCKYZF450
01-04-2007, 09:18 AM
I have a '04 YFZ 450 w/ HMF sport series full pipe...Its jetted to there recomendations 175 main 48 pilot no airbox lid...when im decelerating or rev it in neutral (not always reving it) the quad will backfire shooting out a blue small flame at night. then in 4th and 5th it tends to be pretty flat more less 5th than 4th. in an about 600 ft. run i take a banshee('01 Mint Mint cond. pipped and jetted (fmf)) through the first three gears but in 4th and 5th he gains and then passes like 65 percent of the time. if any one could help i would appreciate it i havn't seen to much dicussion about this