NCY Cylinder Head 50mm 81cc 2V (139QMB)
Description: NCY Cylinder Head 50mm 81cc 2V for 139QMB 49/50cc 4-stroke engines. Great quality alloy cylinder head designed to work seamlessly with NCY Cylinder 52mm 88cc (Part# 1100-1248) big bore kit. Give your 139QMB the power to handle today's city traffic.
NOTE: Most stock 139QMB cylinder head's valve height is 69mm which comes standard with its 69mm rockerarm. This NCY Cylinder Head's valve height is 64mm and will work only with a 64mm rockerarm only. If you need a set of 64mm rockerarm see Part# 1100-1326 sold separately.
Includes the following Cylinder Head and Valves Assembly.
• 1x Cylinder Head Stud Space: 50mm / H: 60mm / Intake Port: 24mm / Exhaust Port: 22mm
• 2x Valves: 21.5x64mm Intake / 19x64mm Exhaust / Stem: 5mm / (w/intake valves) H: 66.1<67.3mm
• 6mm Intake Threads
• 6mm Exhaust Threads
• Made in Taiwan
• Fit Intake Studs: M6 / Nuts: M6 / Socket: 10mm
• Fit Exhaust Studs: M6 / Nuts: M6 / Socket: 10mm
• Fit Rocker Arm Assembly: 64mm / Feeler Gauge: .004in / .005in / Socket: 9mm
• Fit Cylinder Studs: 168mm 176mm / Nuts: M7 / Washers: M7 / Side Bolts: M6 / Socket: 8mm-10mm
• Fit 50mm Stud Spacing /Diagonal 70.5mm
• Fit Cylinder 50mm to 52mm
• Fit Crankshaft 41.4mm to 44mm
• Fit Dowel Pin Set (8x14mm)
• Fit QMB 49/50cc+
Supported Models: 139QMB 49cc-50cc engines, Baja SC50, Boreem (BMS) 50, Filly 50, Kymco 50, Panterra 50, Qingqi 50, QLink 50, Roketa 50, SUNL 50, SYM 50, Tank 50, TaoTao 50, and virtually any other scooter engine with these measurements.
Item Weight & Product Dimensions:
• 2.194 Pounds | 5.322" (L) x 5.290" (W) x 2.610" (H)