57.4mm Cylinder Head Assembly with Spark Plug for 4-Stroke GY6 150cc Yerfdog GX150 Spiderbox Tomerlin Crossfire

Product Overview

Restore the compression and reliability of your 150cc machine with the GOOFIT 57.4mm Cylinder Head Kit. This direct-replacement assembly is a favorite for Yerfdog GX150 Spiderbox and Tomerlin Crossfire enthusiasts, as well as owners of TaoTao and BMS scooters. Designed for a leak-proof seal and optimized gas flow, this kit includes a performance-matched 10mm spark plug and gaskets to ensure your engine delivers consistent power output across all terrains.

Product Compatibility

A high-performance replacement for 4-stroke GY6 150cc (157QMJ / 152QMI) engines.

Vehicle Type	Popular Compatible Models
Go Karts	Yerfdog GX150 Spiderbox, Tomerlin Crossfire 150/150R, Coolster 3150DX2
Scooters	TaoTao 150, Lance Vintage 150, Eaglecraft, Tank, BMS, Baja SC150
Compatible Brands	Jonway, JCL, Flyscooter, Schwinn, Verucci, Yamati

⚠️ EXCLUSION NOTICE:

• NOT a replacement for 2013 Kymco Super 8 150.
• Please verify your engine is a standard 4-stroke GY6 150cc before purchase.

Specifications

Attribute	Details
Cylinder Head Bore	57.4mm / 2.25"
Spark Plug Size	10mm Diameter (For 4-Stroke)
Engine Code	GY6 150cc (157QMJ / 152QMI)
Package Includes	Cylinder Head, Gasket Set, Spark Plug
Fitment Type	Direct Installation / Bolt-On

Key Features

• Direct "Bolt-On" Installation: Precision-engineered to match OEM dimensions for GY6 150cc platforms, allowing for a straightforward replacement without modifications.
• Leak-Proof Sealing: Features a meticulously leveled mating surface and premium gaskets to ensure zero air leakage and maximum combustion chamber pressure.
• Optimized Power Output: Designed to complement high-performance pistons, this head improves air-fuel mixture flow for more responsive acceleration and stable idling.
• Complete Maintenance Bundle: Saves you time by including a high-quality 10mm spark plug and all essential head gaskets in one convenient package.
• Heavy-Duty Construction: Built from heat-resistant aluminum alloy to withstand the high-temperature demands of both street commuting and off-road go-karting.