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77mm 350CC Bore-Up Cylinder Piston Kit | For 172FMM 175FMM CB250-F CPS350
This is an aftermarket performance upgrade kit, NOT a genuine OEM component. It upgrades 250cc engines (172FMM/CB250-F) to 350cc, and fits CPS350 models, boosting engine power. Made in China.

Key Specifications

Cylinder/Piston Bore Diameter: 77mm
Engine Displacement Upgrade: 250CC → 350CC (fits CPS350 as OEM replacement)
Compatible Models: 172FMM, 175FMM, CB250-F, CPS350
Package Components: Reinforced cast iron cylinder block, high-performance piston, piston rings, piston pin, circlips, full gasket kit
Construction: High-strength cast iron cylinder, durable forged aluminum piston, premium wear-resistant piston rings
Origin: China

Compatible Engine/Motorcycle Models

172FMM, 175FMM engine platforms
CB250-F motorcycle
CPS350 motorcycle

Core Features

Bore-up upgrade increases displacement from 250cc to 350cc, significantly boosting low-end torque and power output
Direct drop-in installation, matches OEM mounting dimensions without modification
Dual-purpose fit: OEM replacement for CPS350, upgrade kit for 250cc 172FMM/CB250-F
Heat and wear resistant for long-lasting durability in street and off-road riding scenarios
Independent aftermarket product, has no affiliation with original vehicle/engine brands
Complies with eBay product safety, labeling and intellectual property policies

Package Includes

1 × Full 77mm 350CC Cylinder Piston Kit (all components needed for engine top-end overhaul/upgrade)

Guarantee

14-day free returns (buyer responsible for return shipping for non-quality issues) | 3-month manufacturer warranty