Naraku Cylinder 52.4mm 94.9cc 2V Cast Big Bore Kit Duo Combo (139QMB)
Description: High-Quality Naraku Cast-Iron Cylinder 52.4mm 94.9cc with Cast Aluminum Piston offers better durability and reduced friction for 139QMB 49/50cc+ engines. The cylinder bore is 52.4mm. Naraku Cylinders' Combo 52.4mm 94.9cc 2V w/Cast Piston including the following parts Naraku 52.4mm (94.9cc) cylinder kit with cast piston and Naraku oversize 2V head 23/20. Naraku Cylinders' Combo 52.4mm 94.9cc 2V is suitable for all air-cooled 4-strokes, 49-50cc Kymco engines (scooters), and most Chinese imported vehicles 49/50cc (scooters, quads, and buggies).
When used in conjunction with a stock stroke of 41.4mm the engine displacement comes out to 89.3cc! When used with a 44mm stroker crank, engine displacement = 94.9cc!
NOTE: Please, measure with a caliper 139QMB crankcase bore (opening) for 54.5mm cylinder outer diameter sleeve need a minimum 54.6mm bore clearance or boring and machining are required. If, engine case must be bored, order an engine bore tool (Part# 1400-1001). Most stock 139QMB cylinder head's valve height is 69mm which comes standard with its 69mm rockerarm. This Naraku Cylinder Head's valve height is 64mm and will work only with a 64mm rockerarm. If you need a set of 64mm rockerarm see Part# 151-101 sold separately.
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Includes the following Cylinder, Base gasket, Piston, Rings, Piston pin, Circlips, Cylinder head, Head gasket, Exhaust gasket.
1. Includes Naraku Cylinder 52.4mm 2V, Piston + Rings, Gaskets (chain tensioner gasket, base gasket, steelhead gasket, exhaust ring), Wrist pin, and Circlips.
• 1x Cast-Alumin Piston: 51.86mm
• 5x Piston Rings (installed): 52.4mm
• 1x Wrist Pin w/G-clips: 41mm x 13mm x 8mm
• 1x Cast-Iron Cylinder: 52.33mm
• Outer Sleeve Diameter 54.5mm
• Overall Height (w/sleeve): 70.44mm
• Cylinder Height (w/o sleeve): 53mm
2. Includes Naraku Cylinder Head 52.4mm 2V NON-EGR, Valve Assembly.
• 1x Cylinder Head Stud Space: 50mm / H: 60mm / Intake Port: 20.8mm / Exhaust Port: 18.7mm
• 2x Valves: 23x64mm Intake / 20x64mm Exhaust / Stem: 5mm
• Overall Height (w/valves) H: 66.1<67.3mm
• Cylinder Height (w/o valves): 59.75mm
• 6mm Intake Threads
• 6mm Exhaust Threads
• Made in Taiwan
• Fit Intake Studs: M6 / Nuts: M6 / Socket: 8mm
• Fit Exhaust Studs: M6 / Nuts: M6 / Socket: 8mm
• Fit Rocker Arm Assembly: 64mm / Feeler Gauge: .004in / .005in / Socket: 9mm
• Fit Cylinder Studs: 168mm 176mm / Nuts: M7 / Washers: M7 / Socket: 10mm
• Fit 50mm Stud Spacing /Diagonal 70.5mm
• Fit 64mm Rocker Arm 2V Assembly
• 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:
• 1.456 Pounds | 4.567" (L) x 4.275" (W) x 2.776" (H)
• 2.193 Pounds | 5.227" (L) x 5.323" (W) x 2.598" (H)