Piston Set 90cc

C90 Piston Set (Includes Piston, Pin & Circlips)

For Moped, Cub & ATV

Fits Engines: 139FMB 147FMD 147FMF 150FMG

High-quality C90 piston set, including piston, piston pin, and circlips - a complete replacement for worn original components.

This product is a C90 series piston set, designed for horizontal engines used in mopeds, Cub motorcycles, and ATVs. It perfectly fits classic engine models such as 139FMB, 147FMD, 147FMF, and 150FMG. The piston is manufactured from high-quality aluminum alloy, offering light weight, good thermal conductivity, and low expansion coefficient. The piston set includes: Piston, Piston Pin, and Piston Pin Circlips, providing you with a complete piston assembly for engine overhaul or cylinder upgrade.

This piston set is primarily compatible with the following 90cc horizontal engines:

• Quality Aluminum Alloy: Made of high-silicon aluminum alloy, offering low expansion coefficient, light weight, and excellent thermal conductivity, suitable for high-revving engines.
• Precision Machining: Piston skirt profile is optimized for proper clearance with the cylinder wall, reducing friction and noise.
• Reinforced Ring Grooves: Piston ring grooves are treated for wear resistance, effectively extending the life of both the piston and piston rings.
• Complete Set: Includes all necessary components for installation (piston, pin, circlips) - a one-stop solution for convenience.

✅ Typical Symptoms of Worn or Damaged Piston: Hard starting, significant power loss, burning oil (blue smoke from exhaust), low compression, unusual engine noises (knocking or pinging). If you experience these issues, the piston assembly may need replacement.

⚠️ Installation Note: When installing a new piston, pay attention to the installation direction (usually indicated by an arrow on the piston crown pointing towards the exhaust side). When installing the piston pin circlips, ensure they are fully seated in their grooves, and do not align the clip opening with the thrust direction of the pin bore. It is recommended to replace the piston rings and cylinder head gasket at the same time. Allow proper engine break-in after installation.