Brand new TRANSMISSION GEAR BOX W/ REVERSE for Hammerhead Carter 150cc Go Kart Replace part # 6.000.157 & 6.000.019 Only works with models with Forward and Reverse external gearbox, NOT compatible with F/N/R models with internal reverse Package includes: External gearbox with forward (1:1 ratio) and reverse Slip over yoke Mounting bracket Details: Engine sprocket #530 chain size Reverse Gearbox works with: Hammerhead GT150, SS150, Standard 150, Junior 150, UM150 and LM150 Hammerhead GTS150 1st generation only Carter Talon 150 w/ external reverse