General Specifications
HP / kW
40 HP / 29.8 kW
Displacement
691 cc (42.2 cu in.)
Cylinders
2 (Inline-2)
WOT RPM
4200 - 4800
Weight
63 kg / 139 lbs
Drive & Lower Unit
Gear Ratio
1.85
Shaft Length
15" Short, 20" Long
Electrical System
Alternator Output 126 Watts
Starting System Manual or Electric
Technical Maintenance Toolkit
Verified service specifications for the McCulloch 40hp Custom (1965)
Lubrication
Engine Oil
10W-30 FC-W
Gearcase Lube 440 ml
Ignition System
Spark Plug
Champion J4C
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 4200-4800
Alternator 126W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the McCulloch 40hp Custom is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the McCulloch 40hp Custom:
Model Evolution
History of the McCulloch 40HP series over the years:
Standalone production year.
Category Discovery
Reference Data
Information compiled from McCulloch Marine factory service manuals and original sales literature published in 1965.