GY6 Big Valve Cylinder Head - 61mm 171cc Kits
ITEM# TT-26784
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Description
61mm Big Valve Cylinder Head for GY6 171cc Engines
This 61mm big valve cylinder head is built to raise the output of a 171cc GY6 engine. It is meant to be used with the 61mm big bore kit (1100-1288), which allows more air to flow through the engine. The head plays a key role in quicker throttle response and better acceleration. It is one of the GY6 scooter parts you can use to upgrade your engine.
Better Airflow from Larger Valves
The head uses bigger intake and exhaust valves, at 27.8 mm and 22.9 mm. A two-valve combustion chamber and a precisely machined mating surface help air move through the engine more freely. Its heat-dispersing body also helps the engine run steadily during hard riding.
Fitting and Compatibility
Valves and valve springs come already installed, so assembly is simple. The camshaft, rocker arm assembly, and cylinder set are not included and must be bought separately. To confirm a match with GY6-A engines, check that the cylinder studs are spaced 54 mm apart and 76 mm apart diagonally.
Specifications
- Part Number: 622C03GY661
- Target Cylinder: 61 mm / 171cc kit 1100-1288
- Cylinder Stud Spacing: 54 mm, 76 mm diagonal
- Intake Valve Diameter: 27.8 mm
- Exhaust Valve Diameter: 22.9 mm
- Exhaust Thread: 8 mm
- Country of Origin: Taiwan
- Fits: GY6 150cc (157QMJ) engines with the NCY 61mm 171cc big bore kit (1100-1288), 54 mm stud spacing
Fitment
Compatible with:
- GY6 150cc (157QMJ) engine (with NCY 61mm 171cc kit 1100-1288, 54 mm stud spacing, GY6-A case)
- Buddy 150 and Blur 150 (with compatible GY6-A engine)
- TaoTao, Wolf, Ice Bear, Bintelli, Peace Sports, ZNEN, SSR and SYM scooters (select, with matching engines)
- Hammerhead 150, Trailmaster 150, Yerf-Dog and Carter Talon karts (select, with matching engines)
How to choose: Make sure the 61 mm bore matches the NCY kit 1100-1288 and the 54 mm cylinder stud spacing matches your GY6-A engine case. It will not fit GY6 B-block cases.
Where it goes: part #1 on the cylinder head diagram for the GY6 150cc (157QMJ).
Other versions: For a GY6 cylinder head with valve guides for 125 cc, see Cylinder Head (With Valve Guides) for Genuine, GY6 125 cc. For the GY6 150cc (157QMJ) Blue Line head at 57mm, see GY6 150cc (157QMJ) Engines Cylinder Head 57mm. For the GY6 big valve head at 58.5mm with 2 valves, see Genuine/GY6 Big Valve Cylinder Head (58.5mm, 2 Valve).
Shop more: GY6 Scooter Parts · Chinese Scooter Parts · Scooter Cylinder Heads & Valves · Scooter Parts
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