NCY 72cc Big Bore Piston & Cylinder Kit — Yamaha & Genuine 2

Name: NCY 72cc Big Bore Piston & Cylinder Kit — Yamaha & Genuine 2
Brand: NCY
SKU: PRCK1
Price: 200.0 USD
Availability: InStock

SKU PRCK1

$200.00

Shipping calculated at checkout.

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Description

NCY replacement piston assembly for Genuine Buddy 50, RoughHouse 50, and 2T Minarelli bikes running NCY's 47mm Cylinder Kit. Pick up a replacement gasket set while you're at it.

Specifications:

Includes piston, pin, clips, rings
Aluminum Piston: 47mm
2 Piston Rings: 47mm
Wrist Pin w/G-clips: 10mm

Compatibility:

Performance Highlights

72cc Displacement: Increased bore diameter (47mm) provides a 40%+ increase in displacement over stock, resulting in explosive off-the-line takeoffs.
Cast Iron Construction: Chosen for superior heat retention and durability, making it more forgiving during the "break-in" period than expensive aluminum/nikasil kits.
Optimized Porting: Intake and exhaust ports are precision-cast to improve scavenging, allowing your engine to breathe better at higher RPMs.
Complete Top-End Overhaul: Includes everything needed for a fresh build—cylinder, piston, rings, wrist pin, clips, and a full top-end gasket set.

Detailed Model Fitment

Designed for Minarelli-style (1PE40QMB) horizontal 50cc 2-stroke engines with a 10mm wrist pin:

Brand	Compatible Models
Genuine Scooter Co.	Buddy 50, RoughHouse 50, Black Jack 50, Rattler 50
Yamaha	Zuma 50 (2002-2011 "Bug Eye"), Vino 50 (2-Stroke), Jog
Adly / Chinese 2T	Fox, Jet 50, Noble 50, Thunder Bike, and most 1PE40QMB clones

What’s Included:

47mm Cast Iron Cylinder
Performance Piston & Rings
10mm Wrist Pin & G-Clips
Head Gasket & Base Gasket

CRITICAL TUNING NOTE: You MUST up-jet your carburetor after installing this kit to prevent "soft-seizing" from a lean fuel mixture. We recommend starting with a main jet 10-15 sizes larger than stock. Professional installation is highly recommended.

Product Diagrams

Model Fitments

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