Universal Parts
Universal Parts 57mm PAIR Cylinder Head - GY6 150cc
Description
Get your GY6 rebuild moving with the Universal Parts 57 mm PAIR Cylinder Head for GY6 150cc engines. This complete replacement head includes installed intake and exhaust valves, valve springs, and intake and exhaust studs, helping you replace a worn or damaged head without starting with an empty casting. Cooling fins and machined sealing surfaces support the original air-cooled engine layout, while the PAIR provision accommodates the secondary-air emissions system.
Key Features
- Complete Valve Assembly: Installed intake and exhaust valves and springs simplify your cylinder-head replacement.
- PAIR-Compatible Design: Accommodates the Pulsed Secondary Air Injection system, which introduces air into the exhaust flow to help reduce hydrocarbon and carbon monoxide emissions.
- 57 mm Application: Designed for compatible 150cc GY6-A four-stroke engines.
- Included Mounting Studs: Intake and exhaust studs are included for connecting the manifolds.
- Fit-Check Dimensions: 54 mm head-stud spacing and 60.5 mm overall height help you match the replacement to your engine.
Technical Specifications
- Brand: Universal Parts
- Part number: 164-302
- Manufacturer part number: 4787
- Type: Complete emissions-type cylinder head
- Engine platform: GY6-A four-stroke
- Primary application: 150cc QMJ157
- Bore application: 57 mm
- Overall height: 60.5 mm
- Head-stud spacing: 54 mm
- Diagonal head-stud spacing: 76.5 mm
- Diagonal valve-cover bolt spacing: 144 mm
- Intake valve diameter: 29 mm
- Exhaust valve diameter: 23.5 mm
- Emissions provision: PAIR secondary-air system
- Included: Installed valves and springs; intake and exhaust studs
Compatibility
| Engine application | Fitment requirements |
|---|---|
| GY6-A 150cc QMJ157 / 157QMJ | Match 57 mm bore application, 54 mm stud spacing and head configuration |
| GY6 QMI/QMJ 152/157 applications | Confirm cylinder bore, stud spacing, valve-cover bolt layout and PAIR arrangement before ordering |
Match the engine code and dimensions to your existing head before installation. For an off-road vehicle that was not equipped with a secondary-air system, the PAIR provision can be blocked off as appropriate for the installation. Do not treat this as a universal fit for every GY6 engine.
Product Diagrams
Features
Specifications
Brand: Universal Parts; Part number: 164-302; MPN: 4787; Type: complete PAIR emissions-type cylinder head; Engine: GY6-A four-stroke, 150cc QMJ157; Bore application: 57 mm; Overall height: 60.5 mm; Head-stud spacing: 54 mm; Diagonal head-stud spacing: 76.5 mm; Diagonal valve-cover bolt spacing: 144 mm; Intake valve diameter: 29 mm; Exhaust valve diameter: 23.5 mm; Includes: installed valves and springs, intake and exhaust studs; Restriction: off-road use only
Model Fitments
GY6-A 150cc QMJ157/157QMJ; GY6 QMI/QMJ 152/157 applications with matching 57 mm bore application, 54 mm stud spacing, 76.5 mm diagonal head-stud spacing and 144 mm diagonal valve-cover bolt spacing; confirm PAIR arrangement and existing head configuration; off-road use only
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
