Updated version of Mikuni's BN series carbsDesign features improved airflow and higher-capacity fuel pump for more demanding applicationsExternally adjustable metering screws and replaceable jets make high- and low-speed tuning easyConventional butterfly choke for easy starting; 38mm carb uses primer34MM CARBOEM replacement on Yamaha WaveRunner 500 and WaveJammer 500Uses stock jetting38MM CARBDirect bolt-on for many modelsUses stock jetting44MM CARBCan be used on many modelsOEM replacement for Yamaha SuperJetUses stock jetting46MM CARBUses 44mm bolt pattern