Products / CB250-F
Air-Cooled Motorcycle Engine
CB250-F Engine
CB250-F is a air-cooled motorcycle engine for two-wheel motorcycles / off-road models, suitable for OEM supply, replacement projects, customization programs and overseas bulk purchasing.
Mounting Drawing
Mounting Drawing
Technical Data
Complete Technical Specifications
Basic Product Information
Product Name CB250-F
Engine Name CB250-F
Engine Model 172FMM-F
Compatible Vehicle Two-wheel motorcycles
Product Type Two-wheel powertrain / Off-road powertrain
Main Technical Specifications
Engine Type Single cylinder, 4-stroke, air-cooling, camshaft upward
Displacement (ml) 249.99
Max. Power (kw/r/min) 13.8/8000
Max. Torque (N.m/r/min) 18.5/6000
Compression Ratio 9.50:1
Bore and Stroke (mm x mm) 72 x 61.4
Ignition Method CDI
Lubrication Method Pressure and Splash
Min. Fuel Consumption (g/Kw.h) ≤354
Starting Method kick
Clutch Method Manual Wet Multi-Plate
Gearshift Method Constant mesh, two stage transmission, 5-speed Gearshift
Product Highlights
Product Highlights
Chain Drive
Toothed chain timing drive keeps the valve train running smoothly and helps reduce overall engine noise.
Cylinder Head Design
Redesigned cylinder-head appearance provides a clean structure with practical cooling performance.
Heated Crankcase Assembly
Heated crankcase assembly and locating-pin design help reduce crankshaft movement noise and improve engine performance.
Updated Thermal Structure
Optimized cylinder-head oil passages and cooling-air layout improve thermal behavior and reduce mechanical noise.
Roller Valve Rocker Arm
Roller rocker arms and bearing-supported camshaft journals reduce friction and help preserve engine output.
Lightweight Piston with Backside Cooling
Lightweight piston design improves lubrication and cooling while reducing wear under demanding use.
High-Quality Piston Rings
DLC and PVD piston-ring technology improves wear resistance, service life and oil-control performance.
High-Power Starter Motor
Higher starter torque increases the starting safety margin and makes engine start-up easier.
Reinforced Crankshaft Bearing and Shorter Connecting Rod
Reinforced crankshaft bearings and optimized connecting-rod length reduce reciprocating inertia and help control knocking.
Optimized Camshaft Profile
Optimized cam profile improves power and torque delivery, especially during launch and overtaking acceleration.
High-Temperature Valve Material
High-temperature exhaust-valve material improves mechanical performance under hot operating conditions.
Enlarged Shift Drum
A larger shift drum with smoother guide grooves helps deliver cleaner and more stable gear changes.
Reinforced Main and Counter Shafts
Strengthened transmission shafts and gear teeth improve durability and drivetrain reliability.
Offset Crankshaft Technology
Offset crankshaft layout reduces friction loss, improves combustion efficiency and supports better fuel economy.
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