General Specifications
HP / kW
20 HP / 14.9 kW
Displacement
432 cc (26.4 cu in.)
Cylinders
2 (Inline)
WOT RPM
5000 - 6000
Weight
56 kg / 123 lbs
Drive & Lower Unit
Gear Ratio
2.08:1
Shaft Length
15, 20
Electrical System
Alternator Output 192 Watts
Starting System Manual/Electric
Technical Maintenance Toolkit
Verified service specifications for the Yamaha F20 Portable (2024)
Lubrication
Engine Oil
10W-30 FC-W
Oil Capacity 1.6 Liters
Gearcase Lube 250 ml
Ignition System
Spark Plug
NGK DPR6EA-9
Gap Setting 0.035"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 5000-6000
Alternator 192W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Yamaha F20 Portable is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the Yamaha F20 Portable:
Model Evolution
History of the Yamaha 20HP series over the years:
Standalone production year.
Category Discovery
Reference Data
Information compiled from Yamaha Marine factory service manuals and original sales literature published in 2024.