Minarelli 2-Stroke 50cc Engine Rebuild Kit- 40mm

Factory Performance: 50cc Minarelli 2-Stroke Cylinder Rebuild Kit

Restore the compression and smooth power delivery of your scooter with this Complete 50cc Cylinder Assembly. Specifically engineered for Minarelli-style 2-stroke engines, this kit provides a direct, OEM-equivalent replacement for riders looking to refresh a tired or seized engine. From the precision-honed 40mm bore to the high-tensile rings, every component is designed to provide a perfect bolt-on fit without the need for machining or complex modifications.

Comprehensive Top-End Kit

• 40mm Precision Cylinder: Cast from high-grade iron for superior thermal stability and wear resistance, maintaining factory-correct tolerances.
• Complete Piston Set: Includes a lightweight aluminum alloy piston, two high-compression rings, a 10mm wrist pin, and secure circlips.
• Full Gasket Set: Comes with a cylinder head gasket and base gasket to ensure a leak-free seal and optimal combustion pressure.
• Direct Bolt-On: Calibrated to match original factory porting, ensuring your scooter maintains its original fuel efficiency and throttle response.

Comprehensive Fitment Guide

This kit is designed for the Minarelli (Horizontal or Vertical) 50cc 2-Stroke engine platform (1PE40QMB / 1E40QMB):

Technical Specifications

• Bore Size: 40mm (Stock 50cc)
• Wrist Pin Diameter: 10mm
• Cooling Type: Air Cooled
• Material: Cast Iron Cylinder / Aluminum Piston

Mechanic's Note: Loss of power or difficulty starting is often a sign of worn rings or scored cylinder walls.

Installation Tip: Before assembly, apply a light coat of 2-Stroke Oil to the cylinder walls and piston rings to prevent a "dry start."

Pro Tip: Always verify your wrist pin size before ordering; while 10mm is the standard for most Minarelli engines, some high-performance cranks use a 12mm pin!

SKU: 1100-1250
Vendor: Scooterworks

• Genuine Scooters: Buddy 50, RoughHouse 50,  and Rattler 50.
• Yamaha: Zuma (YW50) '02–'11, Jog.
• Adly: Fox, Jet, Noble, Thunderbike.
• Eton: Beamer, Matrix, PN2B, PN2C, SF1A
• Daelim: Cordi, E-Five, S-Five

*This product is intended as an OEM equivalent for listed models. Any misuse, alteration or alternative application is prohibited by law.

• OEM-Spec Performance: 40mm bore size designed to restore original factory power and compression.
• Complete Top-End Kit: Includes high-quality piston, rings, 10mm wrist pin, and circlips for a hassle-free rebuild.
• Plug-and-Play Fitment: Direct bolt-on replacement for Minarelli-style horizontal 2-stroke engines.
• Engineered for Durability: Cast iron cylinder construction designed for long-lasting heat dissipation and reliability.

Sizing Guide: Standard 40mm bore. Note: Some European models use a 12mm wrist pin; please verify yours is 10mm before ordering.