Propellers - BRP Johnson 4HP Service Manual

GENERAL INFORMATION

PROPELLERS

PROPELLERS
An outboard motor is designed to develop its rated power
within a specified engine speed range. The maximum rated
power delivered is shown below.
Recommended full
throttle speed range
If the standard propeller fails to meet the above requirement,
use another pitch propeller to hold the engine speed within
the range specified above.
Propeller selection chart
Blade ×
3 ×
3 ×
3 ×
Installing a propeller with pitch either too high or too low
will cause incorrect maximum engine speed, which may
result in severe damage to the motor.
1-6
4 HP, 4000 – 5000 r/min
5 HP, 4500 – 5500 r/min
6 HP, 4750 – 5750 r/min
Diam. (in) × Pitch (in)
7 1/2 ×
7 1/2 ×
7 1/2 ×
6
6 1/2
7