SSP-G 67mm Cylinder Kit 4 Valve | GY6-B 161QMK Engines

Push your GY6-B / Gy7 / 161QMK  build to 232cc with the SSP-G 67mm 4V Cylinder Kit. This ceramic-coated cylinder with a forged piston is designed for the 4-valve Cygnus-style cylinder head and fits B-case GY6 4-stroke engines also called GY7 and marked with 161QMK engine codes. Pair it with a 66mm (+8.2mm) stroker crank to achieve a 232 cc displacement. Everything needed for the cylinder swap is included.

What's Included

• 67mm ceramic-coated cylinder
• Forged piston
• Rings, wrist pin & circlips
• Head gasket & base gasket

Key Features

• Ceramic-coated cylinder — improved heat dissipation and reduced friction
• Forged piston — stronger and lighter than cast for high-performance applications
• 4V Cygnus-style head compatible — designed for 4-valve cylinder head setups
• 232cc capable — pair with a 66mm (+8.2mm) stroker crank for maximum displacement
• B-case (57mm stud spacing) GY6 fitment

Specifications

• Cylinder Bore: 67mm
• Cylinder Height: 76mm
• Overall Height: 103.5mm
• Stud Spacing: 57mm (B-case)
• Wrist Pin Diameter: 15mm
• Compatible Engine: GY6 QMI/QMJ 152/157 (B-case long case)
• Max Displacement: 232cc (with 66mm stroker crank)

This product is intended for off-road use only and is not intended for use on public roads.

California Prop 65 Warning: www.p65warnings.ca.gov

• Ceramic-coated cylinder for improved heat dissipation and reduced friction
• Forged piston for high-performance builds
• Requires a matching four-valve Cygnus-style cylinder head
• Nominal 232cc configuration requires a separate 66mm (+8.2mm) stroker crankshaft
• B-case application with 57mm cylinder-stud spacing; verify complete build dimensions
• Includes rings, wrist pin, circlips, head gasket and base gasket

Brand: SSP-G; Part number: 169-573; Bore: 67mm; Cylinder height: 76mm; Overall height: 103.5mm; Stud spacing: 57mm B-case; Wrist pin: 15mm; Cylinder coating: ceramic; Piston: forged; Application: compatible GY6-B/GY7/161QMK and B-case QMI152/QMJ157 builds; Required head: matching four-valve Cygnus-style, separate; Nominal 232cc configuration: separate 66mm (+8.2mm) stroker crankshaft required; Includes: cylinder, piston, rings, wrist pin, circlips, head and base gaskets; Origin: Taiwan; Use: off-road only

Compatible GY6 B-case / GY7 / 161QMK four-stroke builds; GY6 125/150cc QMI152 and QMJ157 applications only with compatible B-case configuration; requires 57mm cylinder-stud spacing and matching four-valve Cygnus-style head; verify crankcase opening, cylinder height, wrist pin and crankshaft stroke; nominal 232cc configuration requires separate 66mm (+8.2mm) stroker crankshaft; Cygnus-style is not direct Yamaha model fitment; off-road use only