Selecting the right piston from the FIM (Federal Izumi Manufacturing) catalog is essential for optimizing your engine's performance, whether you're performing a standard rebuild or a high-performance upgrade. FIM is a major Indonesian manufacturer known for producing high-quality pistons for popular motorcycle brands like Honda, Yamaha, and Suzuki. 1. Identify Your Engine and Base Size

Disclaimer: Specifications and part numbers are subject to change by the manufacturer. Always verify fitment with a professional mechanic.

Material & Technology: Many FIM pistons use a Hi-Dome design for increased compression and features such as molybdenum coating or hard anodizing to reduce friction. Performance Tiers:

2. Four-Stroke Underbone & Matic (Honda, Yamaha, Suzuki)

For daily drivers and sport scooters, FIM focuses on ring tension and skirt coating to reduce friction.

2.2. Dimensional Specifications

Critical parameters recorded:

FIM 90/93 (Custom Dome): Piston "mentahan" dengan high dome untuk modifikasi balap, tersedia dalam diameter besar seperti 65.5 mm hingga 72 mm dengan pilihan pin 15 atau 16. Katalog Ukuran Pin Piston FIM

1. Material Grade

• OEM: High quality but expensive.
• FIM: Equivalent to OEM (JIS standard Aluminum alloy) at 40-60% of the price.
• No-Name (Xing Fu, etc.): Cheap porous aluminum that cracks under heat.