General Specifications
HP / kW
5 HP / 3.7 kW
Displacement
102 cc (6.2 cu in.)
Cylinders
1 (Inline)
WOT RPM
4000 - 4500
Weight
17 kg / 37 lbs
Drive & Lower Unit
Gear Ratio
4.0:1
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 Silver Century Plus (1975)
Lubrication
Engine Oil
SAE 30 (10:1)
Gearcase Lube 172 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 4000-4500
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 Silver Century 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 Silver Century Plus:
Category Discovery
Reference Data
Information compiled from British Seagull Marine factory service manuals and original sales literature published in 1975.