PDA

View Full Version : WB R4 Questions


shorty's400ex
03-02-2003, 10:56 PM
426 11:1 wiseco with WBR4 anyone have this ? if so what are your jettings? I am having trouble with mine. when i bought my pipe the said stock jetting is best. is this only for stock though? does it need to be richer cause of the larger bore?
jb400exxx
03-02-2003, 11:20 PM
you have to rejet with any exhaust no matter what anybody says! it should not have ran right at all. go up at least 2 sizes on the main and raise the needle.