NCY
NCY Big Valve High-Flow GY6 Cylinder Head - 61mm 171cc
Description
Let your 171cc GY6 build breathe with the NCY 61mm big-valve cylinder head, the matching head for the NCY 61mm big bore kit (1100-1288). Its larger 27.8 mm intake and 22.9 mm exhaust valves support the airflow a bigger-bore build calls for, giving you a stronger foundation for responsive acceleration once the engine is assembled and tuned. This performance cylinder head includes installed valves and valve springs.
Camshaft, rocker assembly, and cylinder kit sold separately.
Key Features
- Built for the matching NCY kit: Pairs with 61 mm / approximately 171cc cylinder kit 1100-1288 on a compatible GY6-A engine.
- Bigger valves for bigger builds: 27.8 mm intake and 22.9 mm exhaust valve diameters.
- Airflow-focused head: Two-valve combustion chamber and machined mating surface.
- Heat-shedding design: Finned metal cylinder-head casting.
- Know what you're buying: Head with valves and springs shown; cylinder, piston, camshaft and rocker assembly are not shown as included.
Technical Specifications
- Part number: 1100-1254
- Manufacturer part number: 622C03GY661
- Brand: NCY
- Target cylinder: NCY 61 mm / 171cc kit 1100-1288
- Cylinder stud spacing: 54 mm, 76mm diagonal
- Engine case: Compatible GY6-A block stud spacing
- Intake valve diameter: 27.8 mm
- Exhaust valve diameter: 22.9 mm
- Exhaust thread: 8 mm
- Country of origin: Taiwan
Compatibility
| Application | Fitment guidance |
|---|---|
| Matching cylinder kit | NCY 61 mm 171cc big bore kit 1100-1288 on compatible GY6-A engines with 54 mm cylinder stud spacing |
| Engine codes | 125–150cc GY6 four-stroke QMI/QMJ applications, including 157QMJ, 1P57QMJ, 152QMI and BN157QMJ, when the kit and head dimensions match |
| Genuine scooters | Buddy 125, Buddy 150 and Blur 150 with a compatible GY6-A engine; verify case and head dimensions |
| Other applications | Select TaoTao, Wolf, Ice Bear, Bintelli, Peace Sports, ZNEN, SSR and SYM scooters, and select Hammerhead 150, Trailmaster 150, Yerf-Dog and Carter Talon karts with matching QMI/QMJ engines |
Does not fit QMK engines or GY6 B-block cases. Match the 54 mm stud spacing, oil passages, mating surfaces and valve-to-piston clearance to the 1100-1288 kit before assembly. A larger-bore, big-valve build requires appropriate fuel-system tuning; carbureted setups may need re-jetting, with jet size determined by the complete build.
For replacement valves, see NCY valve set 1100-1257. Browse more NCY performance parts for your build.
This product is intended for off-road use only. This product is not intended for use on public roads or land.
Product Diagrams
Features
Specifications
NCY performance cylinder head; SKU 1100-1254; MPN 622C03GY661; matches 61 mm / approximately 171cc kit 1100-1288; 54 mm cylinder stud spacing; compatible GY6-A QMI/QMJ applications; intake valve 27.8 mm; exhaust valve 22.9 mm; listed exhaust thread 8 mm; Taiwan origin; excludes GY6 B-block and QMK family including 161QMK and BN161QMK-A; head with valves and springs shown, not a complete top-end kit.
Model Fitments
Matches NCY 61 mm / approximately 171cc big bore kit 1100-1288 on compatible GY6-A 125–150cc four-stroke QMI/QMJ engines with 54 mm cylinder stud spacing. Potential engine codes: 157QMJ, 1P57QMJ, 152QMI, BN157QMJ. Potential Genuine scooter applications: Buddy 125, Buddy 150, Blur 150 with matching GY6-A case. Select TaoTao, Wolf, Ice Bear, Bintelli, Peace Sports, ZNEN, SSR, SYM scooters and select Hammerhead 150, Trailmaster 150, Yerf-Dog and Carter Talon karts only with matching QMI/QMJ engine and head dimensions. Does not fit GY6 B-block or any QMK engine, including 161QMK and BN161QMK-A. Verify stud spacing, oil passages, mating surfaces and valve-to-piston clearance.
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Same day shipping for orders placed before 2PM (CST) M-F
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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.
