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 Forged 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: Make sure your 139QMB crankcase bore is a minimum 55mm opening for bolt-on clearance or boring and machining are required. 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 only. If you need a set of 64mm rockerarm see Part# 151-101 sold separately.
100% Naraku Products – NO SUBSTITUTE.
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), Wrist pin, and Circlips.
• 1x Cast-Alumin Piston: 51.88mm
• 5x Piston Rings (installed): 52.4mm
• 1x Wrist Pin w/G-clips: 41.3mm x 13mm
• 1x Cast-Iron Cylinder: 52.4mm
• Outer Sleeve Diameter 54.5mm
• Cylinder Height (w/o sleeve): 53mm
• Overall Height (w/sleeve): 70.3mm
2. Includes Naraku Cylinder Head 52.4mm 2V NON-EGR, Valve Assembly.
• 1x Cylinder Head Stud Space: 50mm / H: mm / Intake Port: 20.8mm / Exhaust Port: 18.7mm
• 2x Valves: 23x64mm Intake / 20x64mm Exhaust / Stem: 5mm / (w/intake valves) H: mm
• Valve Length: 64mm / Shaft Diameter: 5mm
• 6mm Intake Threads
• 6mm Exhaust Threads
• Made in Taiwan
• Fit 6mm Intake Studs
• Fit 6mm Exhaust Studs
• Fit 64mm Rocker Arm Assembly 2V
• Fit 50mm Stud Spacing /Diagonal 70.5mm
• Fit Crankshaft 41.4mm to 44mm
• Fit Cylinder 50mm to 52mm
• Fit Dowel Pin Set (8x14mm)
• Fit QMB 49/50cc+
Supported Models: GY6 139QMB 49cc-50cc engines, Buddy50, Filly 50, Kymco, QLink, RoughHouse, SYM, TaoTao
Item Weight & Product Dimensions:
• 1.425 Pounds | 4.463" (L) x 4.156" (W) x 2.767" (H)
• 2.194 Pounds | 5.322" (L) x 5.290" (W) x 2.610" (H)