General Specifications
HP / kW
25 HP / 18.6 kW
Displacement
496 cc (30.3 cu in.)
Cylinders
2 (Inline)
WOT RPM
4500 - 5500
Weight
53 kg / 117 lbs
Drive & Lower Unit
Gear Ratio
2.08
Shaft Length
15", 20"
Electrical System
Alternator Output 80 Watts
Starting System Manual/Electric
Technical Maintenance Toolkit
Verified service specifications for the Yamaha 25hp (2-Stroke) (2000)
Lubrication
Engine Oil
Yamalube 2-M
Gearcase Lube 370 ml
Ignition System
Spark Plug
NGK BR7HS-10
Gap Setting 0.028"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 4500-5500
Alternator 80W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Yamaha 25hp (2-Stroke) is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the Yamaha 25hp (2-Stroke):
Model Evolution
History of the Yamaha 25HP series over the years:
Category Discovery
Reference Data
Information compiled from Yamaha Marine factory service manuals and original sales literature published in 2000.