General Specifications
HP / kW
4 HP / 3.0 kW
Displacement
83 cc (5.1 cu in.)
Cylinders
1 (Inline)
WOT RPM
4000 - 5000
Weight
21 kg / 46 lbs
Drive & Lower Unit
Gear Ratio
2.08
Shaft Length
15", 20"
Electrical System
Alternator Output None / Magneto Only
Starting System Manual/Electric
Technical Maintenance Toolkit
Verified service specifications for the Yamaha 4hp (2-Stroke) (2000)
Lubrication
Engine Oil
Yamalube 2-M
Gearcase Lube 105 ml
Ignition System
Spark Plug
NGK BR7HS
Gap Setting 0.040"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 4000-5000
Alternator None
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Yamaha 4hp (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 4hp (2-Stroke):
Category Discovery
Reference Data
Information compiled from Yamaha Marine factory service manuals and original sales literature published in 2000.