Custom processing is the purpose RIF2633 size 17.5 19.5 21 (mm) model PHBG manual and automatic applicable models 50CC 70CC 90CC item number SCL-2019090018 specification A: PHBG 17.5 AD automatic damper, A: PHBG 19.5 AD automatic damper, A: PHBG 21 AD automatic damper, B: PHBG 17.5 AS Manual Throttle, B: PHBG 19.5 AS Manual Throttle, B: PHBG 21 AS Manual Throttle Suitable Model KTM YAMAHA HONDA Suitable Model MBK / YAMAHA / PEUGEOT Suitable Model / Derbi / Piaggio Product Name: Motorcycle modified carburetor BOOSTER 17.5mm PHBG 19.5 21 racing carburettor Installed model: Motorcycle universal small-caliber refit Caliber: 17.5 19 .5 21mm Weight: 500g Packing size: 15*10*10mm Packing material: kraft paper box