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

Unlock High-RPM Power: NCY Performance Racing Valves

Experience a "night and day" difference in idle quality and high-end pull with NCY Performance Racing Valves. Engineered to withstand the extreme temperatures of tuned GY6 engines, these valves provide a superior seal compared to soft factory units that often stretch or leak under high stress.

Performance & Engineering

• Precision Lapped Seats: Factory-machined to ensure a perfect 360-degree seal, effectively eliminating compression loss and erratic idling.
• High-Heat Durability: Resists the "mushrooming" and carbon buildup common in standard OEM valves, maintaining consistent valve lash for longer service intervals.
• Optimized Flow Profile: Designed to complement high-flow heads like the NCY Big Valve series, allowing your engine to breathe deeper at 10,000+ RPM.
• Premium Manufacturing: Manufactured to strict quality standards for a level of balance and longevity far superior to unbranded replacement valves.

Comprehensive Fitment Guide

These 28mm intake and 23mm exhaust valves are a direct performance upgrade for 125cc, 150cc, and 171cc 4-stroke engines.

Technical Specifications

• Intake Valve (IN): 27.8mm Diameter | 65.75mm Height | 5.0mm Stem
• Exhaust Valve (EX): 22.90mm Diameter | 65.3mm Height | 5.0mm Stem
• SKU: 1100-1257

Tech Tip: For optimum performance, these valves should be paired with NCY Performance Valve Springs rated for 11,000 RPM. Always lap your new valves into the head using a fine-grit grinding compound to ensure a gas-tight seal before final assembly.

OFF-ROAD USE ONLY: This product is intended for closed-course racing. Not legal for use on public roads in California or on pollution-controlled vehicles.

This product is not intended for use on public roads or land.