NCY Crankcase Decompression Kit - Genuine/GY6

Engine Longevity: NCY Crankcase Decompression Kit

Relieve internal stress and improve the life of your seals with the NCY Oil Decompression Tube. Specifically designed for Genuine Buddy and GY6-based engines, this kit replaces your factory dipstick with a high-flow breather system. By allowing excess crankcase pressure to vent freely, you reduce the risk of oil burn, blown oil seals, and gasket leaks—a critical upgrade for any scooter running at wide-open throttle for extended periods or scooters with performance engine builds

Technical Performance Features

• Pressure Relief System: Effectively vents excess blow-by gases, reducing parasitic drag on the crankshaft and helping the engine rev more freely.
• Premium Materials: Features 27 inches of high-grade, oil and fuel-resistant tubing (12mm ID / 18mm OD) for flexible routing options.
• Billet Aluminum Hardware: Includes a CNC-machined 17mm aluminum filler cap/adapter (18mm thread) and a finished aluminum end cap for a professional, race-ready look.
• Complete Install Kit: Comes ready for immediate setup with stainless steel hose clamps and high-strength zip ties included.

Comprehensive Fitment Guide

This decompression kit is compatible with Genuine scooters and most GY6 engine variants (139QMB & 157QMJ):

Technical Specifications

• Thread Size: 18mm
• Tube Length: 27"
• Cap Material: Anodized Billet Aluminum
• Intended Use: Performance / Off-Road Only

Mechanic's Note: When you increase displacement with a big bore kit, your factory venting is rarely enough.

Installation Tip: Route the breather tube upward toward the frame before pointing it down to prevent oil mist from escaping.

Pro Tip: While you're upgrading your oil system, it's the perfect time to switch to a high-performance Magnetic Drain Plug to catch any metallic debris before it reaches your new cylinder!

SKU: 1100-1282
Vendor: NCY

This product is intended for off-road use only.

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

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

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