General Specifications
HP / kW
40 HP / 29.8 kW
Displacement
737 cc (45.0 cu in.)
Cylinders
2 (Inline)
WOT RPM
4500 - 5500
Weight
84 kg / 185 lbs
Drive & Lower Unit
Gear Ratio
2.42:1
Shaft Length
15, 20
Electrical System
Alternator Output 144 Watts
Starting System Manual/Electric
Technical Maintenance Toolkit
Verified service specifications for the Johnson 40hp Commercial (1996)
Lubrication
Engine Oil
TC-W3 (50:1)
Gearcase Lube 530 ml
Ignition System
Spark Plug
Champion QL77JC4
Gap Setting 0.030"
Firing Order 1-2-3-4
Performance Specs
Idle RPM 700 ± 50
WOT Range 4500-5500
Alternator 144W
Standard Maintenance Intervals
20H Break-in Service
100H Annual Tune-up
300H Water Pump & Seals
Identification
The serial number for the Johnson 40hp Commercial is typically found on a plate located on the transom bracket.
Technical Toolkit
Maintenance Compatibility
These models share common service parts with the Johnson 40hp Commercial:
Model Evolution
History of the Johnson 40HP series over the years:
Category Discovery
Reference Data
Information compiled from Johnson Marine factory service manuals and original sales literature published in 1996.