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Designed specifically for 52mm big bore cylinder kits on QMB139 4-stroke engines
This controller is for the Power Core (hub motor) series only — it will not fit standard chain-driven E90 models
and enhanced power delivery
Brand Compatible Models Bintelli Havoc 150 ZNEN R-X 150
Naraku QMB139 Adjustable Drive Sheave 52.7mm piston Designed specifically for 52mm bigWith more linear slots, Naraku's Adjustable Drive Sheave (torque driver, secondary slider) improves acceleration and top speed in bikes with 50cc 139QMB engines. Specifications: Overall Outer Diameter: 118. 7mm Inner Diameter: 33. 5mm Includes rear pulley, bearings, and nut NOTE: If installing on a CSC go, you'll need these clutch slider pins Compatibility: CSC Bella Classic 50 CSC go CSC go MAX CSC Nitro Sport 50 CSC Pug 50 139QMB based 50cc 80cc
