RDLN Performance 47mm GY6 50 / 139QMB big bore piston kit, SKU 1100-1571, with rings, 13mm pin, and clips for 139QMB 50cc big bore builds. RDLN Performance 47mm GY6 50 / 139QMB big bore piston kit, SKU 1100-1571, with rings, 13mm pin, and clips for 139QMB 50cc big bore builds.
RDLN Performance 47mm GY6 50 / 139QMB big bore piston kit, SKU 1100-1571, with rings, 13mm pin, and clips for 139QMB 50cc big bore builds.

RDLN

RDLN Performance 139QMB 72cc 47mm Piston Kit with Rings

SKU 1100-1571
$11.00
Shipping calculated at checkout.
Description

This RDLN Performance GY6 Piston Kit (SKU 1100-1571) is a 47mm replacement piston assembly for big bore kits installed on GY6 139QMB 50cc engines. A 47mm bore on the stock GY6 50 stroke works out to roughly 72cc, though kits of this size are commonly sold and searched for as 80cc big bore kits. The kit includes the piston, rings, a 13mm piston pin, and two pin clips, so a worn or scored piston can be replaced without buying a complete cylinder kit again.

This product is intended for off-road use only. This product is not intended for use on public roads or land.

Key Features

  • 47mm bore: Matches 47mm big bore cylinders fitted to GY6 139QMB 50cc engines.
  • Complete piston assembly: Supplied with piston rings, a 13mm piston pin, and two pin clips.
  • Rebuild rather than replace: Restores a big-bore cylinder without the cost of a full kit.
  • Durable ring set: Ring pack sized to the 47mm bore for a proper seal and compression.

Technical Specifications

  • Part number: 1100-1571
  • Piston diameter: 47mm
  • Displacement: Approximately 72cc (commonly marketed as an 80cc big bore kit)
  • Piston pin diameter: 13mm
  • Included: Piston, piston rings, piston pin, 2 pin clips
  • Base engine: GY6 139QMB 50cc
  • Brand: RDLN Performance (aftermarket)

Compatibility

Engine code 139QMB
Engine family GY6 4-stroke
Base displacement 50cc
Cylinder bore required 47mm big bore
Piston pin 13mm

 

Check the engine code stamped on your scooter and measure your existing cylinder before ordering. This piston fits 47mm big-bore cylinders on 139QMB GY6 engines only, so confirm your bore diameter and 13mm pin size against the parts you already have. It will not fit a stock 39mm 50cc cylinder.
Product Diagrams
Features
  • 47mm Piston Diameter
  • Includes Piston Rings
  • 13mm Piston Pin
  • Includes 2 Piston Pin Clips
  • For 72cc/80cc Big Bore Kits on GY6 139QMB 50cc
Specifications

Part Number: 1100-1571 | Piston Diameter: 47mm | Displacement: Approx 72cc (sold as 80cc big bore) | Piston Pin: 13mm | Includes: Piston, Rings, Pin, 2 Clips | Base Engine: GY6 139QMB 50cc | Brand: RDLN Performance
Model Fitments

Fits 47mm big bore cylinder kits on GY6 139QMB 50cc 4-stroke engines
  • 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.
Since 1989

Supplying parts and accessories for vintage and modern scooters since 1989 – Over Half a Million Served and Counting!

Comprehensive Resource

From wear-and-tear items like tires and oil filters to aftermarket parts from industry-leading brands.

Dealer Focused

With a committed team of dealer-focused sales reps and streamlined pricing and shipping processes, we are dedicated to supporting your business.

Innovative

Our team constantly strives to develop and source the best new products for your scooter.