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

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

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

$39.99
$39.99
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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.
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Fitment FAQ

Will this part fit my specific model and year?

This cylinder piston kit is intended for 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. Listed year information includes 2013. Key physical/spec details from the product data include Cylinder Head Bore: 57.4mm / 2.25", Spark Plug Size: 10mm Diameter (For 4-Stroke), 10mm Diameter (For 4-Stroke). Use the compatibility table and product photos together before ordering.

Do I need to match the OEM part number?

Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this cylinder piston kit, also compare the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. This is especially important for GY6/Baja/TaoTao GY6/GX150/SC150 models because similar model names can use different parts by year or trim.

What models or situations does this part not fit?

Do not order this cylinder piston kit for machines outside the listed compatibility, or for units with different bore sizes, piston-pin diameters, stroke lengths, stud spacing, or gasket patterns. Model years outside 2013 should be verified separately. Do not rely only on the model name or engine size.

What should I check before ordering?

Before ordering, compare your original part with the photos and check the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. Recheck listed specs such as Cylinder Head Bore: 57.4mm / 2.25", Spark Plug Size: 10mm Diameter (For 4-Stroke), 10mm Diameter (For 4-Stroke). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.