Yamaha 25ESH 2-stroke engine specs
| Engine Model: Yamaha 25ESH |
| Engine Type: 2-stroke 2-cylinder short shaft gasoline outboard engine |
| Total Displacement: 24.1 cu.in (395 cc) |
| Rated Engine Power: 25 Hp (18.4 kW) at 6000 rpm |
| Fuel System: Carburetor |
____________________________________________________________________________________
Engine Model ................ Yamaha 25ESH
Engine Type ................ 2-stroke two-cylinder gasoline outboard engine
Number of Cylinders ................ 2
Displacement, cu.in (cc) ................ 24.1 (395)
Cylinder Bore, in (mm) ................ 2.64 (67.0)
Piston Stroke, in (mm) ................ 2.20 (56.0)
Maximum Engine Power, hp (kW) ................ 25.0 (18.4)
Maximum Engine Speed, rpm ................ 5000-6000
Lubrication System ................ Engine oil and gasoline mixture
Exhaust System ................ Through hub exhaust
Cooling System ................ Water cooling
Ignition System ................ Capacitor discharge ignition (CDI)
Starting System (Std) ................ Recoil starter
Starting System (Opt) ................ Electric starter
Electrical System Rating, Volts ................ 12
Overall Length, in (mm) ................ 36.9 (935)
Overall Width, in (mm) ................ 14.1 (360)
Overall Height (Short Shaft), in (mm) ................ 42 (1070)
Transom Height (Short Shaft), in (mm) ................ 16.5 (420)
Outboard Weight (Short Shaft), lbs (kg) ................ 111 (50.5)
Fuel System Type ................ Carburetor
Fuel Type ................ Unleaded gasoline (86 octane minimum)
Fuel Tank Capacity, gal (L) ................ 6.6 (25.0)
Gear Shift ................ F-N-R
Gear Ratio ................ 2.08:1
Gear Oil Capacity, qts (L) ................ 0.39 (0.37)
Trim System ................ Manual Trim and Tilt
Transom Height (Short Shaft), in (mm) ................ 16.5 (420)
Steering System ................ Tiller handle
Diameter, in (mm) ................ 9.9 (252)
Pitch, in (mm) ................ 9 (228), 10.5 (267), 11.25 (286), 12 (305), 13 (330)
Number Of Blade ................ 3
Material ................ Aluminum
Engine Fuel Type ................ Unleaded gasoline (86 octane minimum)
Engine Oil Type ................ Yamalube 2-stroke outboard motor oil or TC-W certified outboard oil
Gear Lubricant Type ................ Hypoid Gear Oil or API GL5, SAE 90
Gearcase Capacity, qts (L) ................ 0.39 (0.37)
Spark Plug Type ................ NGK B7HS-10
Spark Plug Gap, in (mm) ................ 0.035-0.039 (0.9-1.0)
Check Starter Rope ................ Every 50 hours
Check Gear Oil ................ Every 50 hours
Check Battery ................ Every 100 hours
Check Fuel Lines ................ Every 100 hours
Check Fuel Pump ................ Every 100 hours
Check Anodes ................ Every 100 hours
Check Propeller ................ Every 100 hours
Check Spark Plug ................ Every 100 hours
Clean Fuel Tank ................ Every 100 hours
Check Cooling System ................ Every 100 hours
Check Water Pump ................ Every 100 hours
Check Carburetor ................ Every 100 hours
Ajust Ignition Timing ................ Every 100 hours
Check Idling Speed ................ Every 100 hours
Change Gear Oil ................ Every 100 hours
Replace Water Pump Impeller ................ Every 300 hours
Replace Spark Plug ................ Every 300 hours
Replace Fuel Pump ................ Every 300 hours
Replace Anodes ................ Every 500 hours
Cylinder head bolt, Nm (lb-ft) ................ 30 (22.5)
Flywheel nut, Nm (lb-ft) ................ 110 (80.0)
Propeller nut, Nm (lb-ft) ................ 35 (25.5)
Oil level plug, Nm (lb-ft) ................ 9 (6.5)
Gear oil drain, Nm (lb-ft) ................ 9 (6.5)
Spark plug, Nm (lb-ft) ................ 25 (18.0)
____________________________________________________________________________________
| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
