NCY 28/23mm GY6 racing valve set - pair showing intake (27.8mm) and exhaust (22.9mm) valves with 5mm stems, front view NCY 28/23mm GY6 racing valve set - pair showing intake (27.8mm) and exhaust (22.9mm) valves with 5mm stems, front view
NCY GY6 performance racing valves 28/23mm - angled view showing valve head diameter difference between intake and exhaust NCY GY6 performance racing valves 28/23mm - angled view showing valve head diameter difference between intake and exhaust
NCY racing valve set for GY6 125cc 150cc 171cc - pair of stainless performance valves showing stem and head profile NCY racing valve set for GY6 125cc 150cc 171cc - pair of stainless performance valves showing stem and head profile
NCY 28/23mm GY6 racing valve set - pair showing intake (27.8mm) and exhaust (22.9mm) valves with 5mm stems, front view
NCY GY6 performance racing valves 28/23mm - angled view showing valve head diameter difference between intake and exhaust
NCY racing valve set for GY6 125cc 150cc 171cc - pair of stainless performance valves showing stem and head profile

NCY

NCY High-RPM Racing Valve Set - 28/23mm for GY6

SKU 1100-1257
$37.00
Shipping calculated at checkout.
Description

NCY Performance Racing Valves deliver a noticeable improvement in idle quality and high-end pull on GY6 125cc, 150cc, and 171cc engines. Precision-lapped seats ensure a perfect 360° seal, eliminating compression loss and erratic idling common with soft factory valves that stretch or leak under high stress.

These are also the OEM replacement valves for the NCY Big Valve High-Flow Cylinder Head (SKU 1100-1254). Made in Taiwan. SKU: 1100-1257.

Key Features

  • Precision lapped seats — perfect 360° seal eliminates compression loss and erratic idle
  • High-heat durability resists mushrooming and carbon buildup vs. OEM valves
  • Optimized flow profile for high-flow heads at 10,000+ RPM
  • IN: 27.8mm / EX: 22.9mm — fits GY6 125cc, 150cc, and 171cc BBK applications
  • Premium NCY manufacturing for superior balance and longevity

Specifications

  • Intake Valve (IN): 27.8mm OD | 65.75mm height | 5.0mm stem
  • Exhaust Valve (EX): 22.9mm OD | 65.3mm height | 5.0mm stem
  • MPN: 665C13GY628LL
  • SKU: 1100-1257
  • Origin: Made in Taiwan

Compatibility

Application Engine Codes / Models
Genuine Scooter Co. Buddy 125, Buddy 150, Buddy 170i, Blur 150
Standard GY6 Codes 157QMJ, 152QMI, 161QMK, 1P61QMK, YN1P57QMJ
Big Bore Kits 58.5mm (155cc), 61mm (171cc), 62mm, 63mm BBKs

 

Tech Tip: Pair with NCY Performance Valve Springs rated for 11,000 RPM. Always lap new valves into the head with fine-grit grinding compound to ensure a gas-tight seal before final assembly.

This product is intended for off-road use only. Not legal for use in California on pollution-controlled vehicles. Check local laws before installing.

Performance upgrades are considered racing parts and are not covered by warranty.

California Prop 65 Warning: www.p65warnings.ca.gov
Product Diagrams
Features
  • Precision lapped seats for a perfect 360-degree seal — eliminates compression loss
  • High-heat durability resists mushrooming and carbon buildup vs. OEM valves
  • Optimized flow profile for high-flow heads at 10,000+ RPM
  • IN: 27.8mm / EX: 22.9mm — fits GY6 125cc, 150cc, and 171cc BBK applications
  • Premium NCY manufacturing for superior balance and longevity
Specifications

IN: 27.8mm OD / 65.75mm H / 5.0mm stem | EX: 22.9mm OD / 65.3mm H / 5.0mm stem | MPN: 665C13GY628LL
Model Fitments

Genuine Buddy 125/150/170i, Blur 150; GY6 157QMJ, 152QMI, 161QMK, 1P61QMK; 58.5mm/61mm/62mm/63mm big bore kits
  • Same day shipping for orders placed before 2PM (CST) M-F
  • 30-day return period on eligible items
  • Flat-rate shipping for orders shipped to the 48 Contiguous United States.
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