General Specifications
HP / kW
2.5 HP / 1.9 kW
Displacement
64 cc (3.9 cu in.)
Cylinders
1 (Inline)
WOT RPM
3500 - 4000
Weight
14 kg / 31 lbs
Drive & Lower Unit
Gear Ratio
3.5:1
Shaft Length
18, 24
Electrical System
Alternator Output None / Magneto Only
Starting System Manual (Cord)
Technical Maintenance Toolkit
Verified service specifications for the British Seagull Forty Plus (1970)
Lubrication
Engine Oil
SAE 30 (10:1)
Gearcase Lube 150 ml
Ignition System
Spark Plug
Champion D16
Gap Setting 0.020"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 3500-4000
Alternator None
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the British Seagull Forty Plus is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the British Seagull Forty Plus:
Model Evolution
History of the British Seagull 2.5HP series over the years:
Standalone production year.
Category Discovery
Reference Data
Information compiled from British Seagull Marine factory service manuals and original sales literature published in 1970.