GY6 232cc Cygnus 67mm 4V Forged Piston Kit

67mm Forged Piston Kit for GY6 232cc Engines

This GY6 232cc Cygnus 67mm 4V Forged Piston Kit suits riders building off-road or competition engines who want more output and better efficiency. It is made for GY6 scooter parts and matches 4-stroke engines such as the QMJ152, QMJ157, QMI152, and QMI157. Built from lightweight forged aluminum, this piston offers a reliable way to add power to your engine.

Piston Construction and Design

The piston measures 67mm across and is forged from lightweight aluminum, so it can handle demanding performance use. It has four valve reliefs to suit a 4V Cygnus-style cylinder head. The crown carries the stamp "67.0", which makes it easy to identify and helps with accurate fitting.

Installation and Components

Everything needed for installation comes in the box: one piston, three compression rings, one oil control ring, a 15mm steel wrist pin, and two circlips. With all parts included, the swap is simple on compatible engines. Replace the piston when performance drops or when engine parts show wear.

Specifications

• Piston Diameter: 67mm
• Overall Height: 38mm
• Wrist Pin Diameter: 15mm
• Compatible Valve Sizes: 23mm intake / 25mm exhaust
• Engine Application: GY6 232cc 4-stroke, 4V Cygnus-style head
• Kit Contents: piston, three compression rings, one oil control ring, wrist pin, two circlips
• Fits: GY6 232cc 4-stroke engines with 4V Cygnus-style cylinder heads (67mm bore)

Fitment

Fits:

• GY6 QMJ152 / QMJ157 (232cc 4V Cygnus-style head builds)
• GY6 QMI152 / QMI157 (232cc 4V Cygnus-style head builds)
• Other GY6-based 4V Cygnus-style head 232cc engines

How to choose: Confirm the engine's valve sizes: 23mm intake and 25mm exhaust, on a 4V Cygnus-style head, with a 67mm bore.

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