Product Description
NCY HIGH-RPM RACING VALVE SET
28mm INTAKE / 23mm EXHAUST • GY6 PERFORMANCE
Upgrade or rebuild your performance GY6 cylinder head with the NCY High-RPM Racing Valve Set.
Designed for compatible GY6 125cc, 150cc and big-bore performance engines, these oversized valves feature a 27.8mm intake and 22.9mm exhaust with 5mm valve stems.
They are also the correct replacement valve set for the NCY Big Valve High-Flow Cylinder Head – SKU 1100-1254.
Made in Taiwan by NCY.
WHAT'S INCLUDED
1 × NCY Intake Valve
1 × NCY Exhaust Valve
VALVE SPECIFICATIONS
INTAKE VALVE
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Valve Head Diameter: 27.8mm
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Overall Length: 65.75mm
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Stem Diameter: 5.0mm
EXHAUST VALVE
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Valve Head Diameter: 22.9mm
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Overall Length: 65.3mm
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Stem Diameter: 5.0mm
MPN: 665C13GY628LL
SKU: 1100-1257
Country of Origin: Taiwan
PERFORMANCE FEATURES
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Oversized 27.8mm intake / 22.9mm exhaust valve configuration
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Designed for compatible high-flow GY6 cylinder heads
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Precision-finished valve seating surfaces
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Helps maintain proper cylinder sealing and compression
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Designed for demanding performance and higher-RPM applications
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Increased airflow potential compared with smaller stock-valve configurations
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Excellent for compatible big-bore and high-flow cylinder-head builds
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Premium NCY performance component
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Made in Taiwan
PERFECT REPLACEMENT FOR NCY BIG VALVE HEAD
These are the replacement valves for the:
NCY BIG VALVE HIGH-FLOW CYLINDER HEAD
SKU: 1100-1254
That cylinder head uses the same:
27.8mm Intake Valve
22.9mm Exhaust Valve
5.0mm Valve Stems
Cylinder head is NOT included with this listing.
COMMON PERFORMANCE APPLICATIONS
Designed for compatible GY6 cylinder heads found on:
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GY6 125cc engines
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GY6 150cc engines
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155cc performance builds
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169cc / 171cc performance builds
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58.5mm big-bore applications
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61mm big-bore applications
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62mm / 63mm builds when using a compatible cylinder head
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NCY high-flow performance cylinder heads
Common compatible engine families can include:
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152QMI
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157QMJ
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1P57QMJ
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YN1P57QMJ
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Other compatible QMI / QMJ configurations using these exact valve dimensions
⚠ IMPORTANT FITMENT INFORMATION
WILL NOT FIT QMK / K-BLOCK CYLINDER HEADS
These valves should NOT be purchased for:
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161QMK
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1P61QMK
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BN161QMK-A
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QMK cylinder heads
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K-Block / QMK cylinder heads
QMK/K-Block engines use a different cylinder-head/valve configuration.
DO NOT ORDER BY ENGINE DISPLACEMENT ALONE.
A scooter being labeled 150cc, 170cc or 171cc does not guarantee fitment.
VERIFY YOUR OLD VALVES BEFORE ORDERING
Please compare your existing valves with these measurements:
INTAKE
27.8mm Head × 65.75mm Length × 5.0mm Stem
EXHAUST
22.9mm Head × 65.3mm Length × 5.0mm Stem
Modified engines and aftermarket cylinder heads may use different valve sizes even when the engine code appears compatible.
GENUINE SCOOTER APPLICATIONS
These valves may be used with compatible performance cylinder-head configurations associated with applications such as:
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Genuine Buddy 125
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Genuine Buddy 150
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Genuine Buddy 170i
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Genuine Blur 150
IMPORTANT: Verify the existing cylinder head and valve dimensions before ordering. Model name alone should not be used to determine fitment.
IDEAL FOR PERFORMANCE BUILDS
A great choice when rebuilding or servicing a compatible performance GY6 cylinder head used with:
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Big-bore cylinder kits
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High-flow cylinder heads
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Performance camshafts
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Larger carburetors
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Performance intake systems
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Performance exhaust systems
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Higher-RPM engine combinations
When building a modified engine, always verify valve-to-piston clearance, valve-seat compatibility, valve guides, retainers, keepers and spring compatibility before operation.
FITMENT AT A GLANCE
✓ 27.8mm INTAKE
✓ 22.9mm EXHAUST
✓ 5mm VALVE STEMS
✓ GY6 QMI / QMJ COMPATIBLE HEADS
✓ NCY BIG VALVE HEAD SKU 1100-1254
✓ PERFORMANCE / BIG-BORE APPLICATIONS
✕ NOT FOR QMK HEADS
✕ NOT FOR 161QMK
✕ NOT FOR 1P61QMK
✕ NOT FOR K-BLOCK / QMK HEADS
NCY PERFORMANCE
28/23mm HIGH-RPM RACING VALVE SET
MADE IN TAIWAN
MPN: 665C13GY628LL | SKU: 1100-1257
Distributed by GY6 STORE
