GY6 Big-Bore Exhaust Gasket - Steel & Fiber

GY6 Big-Bore Exhaust Gasket for 125cc and 150cc Engines

This GY6 Big-Bore Exhaust Gasket is designed for off-road riding and suits GY6 performance cylinder and head setups. It creates the seal between the cylinder head and the exhaust header flange, which matters for keeping exhaust leaks away. You can also browse our GY6 scooter parts range for other upgrades. The gasket is made from a composite material that offers the strength needed for demanding performance use.

Construction and Design

The exhaust gasket uses a composite build, combining fiber material with a metal reinforcement. That mix helps it hold a seal when temperatures and pressures run high, which is why it suits big-bore applications. Each order includes one gasket, so you only buy the piece you need.

Installation and Replacement

The gasket sits between the cylinder head and the exhaust header flange to form a snug seal. Before buying, confirm the exhaust opening size and the spacing of the mounting holes. It works with particular GY6 engines and is not a one-size-fits-all part.

Specifications

• Material: Fiber composite with metal reinforcement
• Exhaust-port Inner Diameter: 29.8 mm
• Bolt Spacing: 50 mm center to center
• Quantity: One gasket
• Fits: GY6 125cc (152QMI family) and 150cc (157QMJ family) big-bore cylinder/head kits with 29.8 mm port

Fitment

Fits:

• GY6 125cc engines, 152QMI family (29.8 mm port, 50 mm bolt spacing)
• GY6 150cc engines, 157QMJ family (29.8 mm port, 50 mm bolt spacing)
• Compatible big-bore scooter and ATV cylinder/head kits (29.8 mm port, 50 mm bolt spacing)

How to choose: Check that your exhaust port measures 29.8 mm inside diameter and that the bolt holes are 50 mm center to center before you order. This gasket does not suit every GY6 head.

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