Products / TM250-S 4V
Four-Valve Motorcycle Engine
TM250-S 4V Four-Valve Engine
TM250-S 4V is a four-valve motorcycle engine for two-wheel motorcycles, 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 TM250-S 4V
Engine Name TM250-S(4V )
Engine Model 172FMM-S
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) 250
Net Weight (kg) 33 incl. oil
Max. Power (kw/r/min) 18/8000
Max. Torque (N.m/r/min) 23/6500
Compression Ratio 9.29:1
Bore and Stroke (mm x mm) 72×63
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 6-speed Gearshift
Product Highlights
Product Highlights
Chain Drive
Toothed chain timing drive keeps the valve train running smoothly and helps reduce overall engine noise.
Valve Train
Stable valve-train operation helps reduce engine noise and improve long-term running consistency.
Built-in Oil-Cooled Cylinder Head
Integrated oil-cooling design helps lower cylinder-head temperature and improves thermal stability.
Cylinder Head
Optimized cylinder-head oil passages and structure improve cooling and noise performance.
Heated Crankcase Assembly
Heated crankcase assembly and locating-pin design help reduce crankshaft movement noise and improve engine performance.
Roller Valve Rocker Arm
Roller rocker arms and bearing-supported camshaft journals reduce friction and help preserve engine output.
Balance System
Front-mounted balance structure offsets first-order inertia, reducing vibration and improving ride comfort.
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
Thicker crankshaft bearing structure improves strength and helps reduce reciprocating vibration and knock tendency.
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.
Performance Design
Designed for stable engine performance, practical durability and reliable matching with target vehicle applications.
Performance Design
Designed for stable engine performance, practical durability and reliable matching with target vehicle applications.
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