General Specifications
HP / kW
450 HP / 335.3 kW
Displacement
5559 cc (339.2 cu in.)
Cylinders
8 (V8 60°)
WOT RPM
5000 - 6000
Weight
437 kg / 964 lbs
Drive & Lower Unit
Gear Ratio
1.79:1
Shaft Length
25, 30, 35
Electrical System
Alternator Output 1224 Watts
Starting System Electric
Technical Maintenance Toolkit
Verified service specifications for the Yamaha XTO Offshore 450 V8 (2024)
Lubrication
Engine Oil
5W-30 FC-W (Full Synth)
Oil Capacity 8.5 Liters
Gearcase Lube 1600 ml
Ignition System
Spark Plug
NGK ILFR6G-E
Gap Setting 0.043"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 5000-6000
Alternator 1224W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Yamaha XTO Offshore 450 V8 is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the Yamaha XTO Offshore 450 V8:
Model Evolution
History of the Yamaha 450HP 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.