Yamaha 787-11631-02-97 Engine Piston Assembly

Description:

The Yamaha 787-11631-02-97 Piston is a combustion component used in small engine and kart racing engine cylinder systems. Commonly installed in Yamaha KT100 and RC100 engines to compress the air-fuel mixture for efficient combustion and power generation. Maintenance teams and engine technicians use this part for repair, rebuild, and replacement of worn piston assemblies to restore engine performance.

Applications:

The Yamaha 787-11631-02-97 Piston is used in Yamaha small displacement engine platforms where precise combustion and compression are critical for performance. It is commonly found in Yamaha KT100 kart racing engines and similar 2-stroke applications, operating within the cylinder to convert combustion pressure into mechanical motion. This component is essential during engine rebuilds and maintenance cycles to maintain compression, reduce blow-by, and ensure consistent engine output.

Technical Specifications:

• Brand: Yamaha
• Part Number: 787-11631-02-97
• Product Type: Engine piston
• Function: Compresses air-fuel mixture and transfers combustion force
• Application: Small engine / kart racing engine cylinder system
• Fitment: Yamaha KT100, RC100, and similar 2-stroke engines
• Size: Standard bore configuration (approx. 51–52 mm range across variants)
• Material: Cast or forged aluminum alloy
• Mounting Location: Cylinder bore within engine block
• System Role: Converts combustion energy into mechanical motion
• Supersession: Related variants include 787-11631-06-97 and similar revisions
• OEM Status: Genuine Yamaha replacement component

Common Replacements:

• Yamaha 787-11631-06-97
• Yamaha 787-11631-05-97
• Yamaha 787-11631-03-97