Stage 2 Power Pack for 50cc 4-Stroke 139QMB Chinese Honda Cloned ScootersINCLUDES: NCY Performance Exhaust72cc Big Bore Cylinder KitNCY Variator KitNCY Performance CDIPerformance Air Filter1000 RPM Torque SpringAdjustable 19mm CarburetorDOES NOT INCLUDE BELT COMPATIBILITY: BMS – Apache 50 4T, Heritage 50 4TDiamo – Classic 50 4TGilera – Capri 50 4T, Ciclone 50 4TLance – Charming 50 4T, GTR 50 4TRoketa – Bahama 50 4T, Maui 50 4T, Sicily 50 4TTank – Urban 50 4T, Sporty 50 4T, Viaggio 50 4TMany Other 50cc 139QMB Based Engines**NOTE: EXHAUST MAY NOT FIT YOUR MODEL. MODIFICATIONS MAY BE REQUIRED****