Brand New CARB WITH 1 1/4" OR 32MM on center mounting holes. Manual choke and TOP FUEL INLET. THIS IS NOT THE ORIGINAL KEIHIN BUT HAS THE EXACT SAME SPECS. Why repair or rebuild when you can buy this new unit. Jets are replaceable. Fits: Honda Z50 Z50R Z50A XR50 AND MANY OTHER JAPAN ENGINES AND CHINA DIRT BIKES AND GO CARTS. INTAKE SIDE IS 28MM WHERE THE AIRBOX MOUNTS. REAR OPENING IS 14MM. These work great on 49cc engines.Honda Z50 Z 50 R 50cc Dirt Pit Bike 50R MONKEY CHINA XR PZ-10 CARB