dddd
Yamaha information / informatie

PROPELLER IDENTIFICATION

The propeller identification of the size is indicated as follows.

Diameter: Diameter of propeller rotating circle. Pitch: Logical advancing distance when propeller rotated one time.

The location of the propeller identification varies.

Refer to the illustration as shown.

Example:

(1) 7-1/4 X 6 - BS

(2) 21 - ML (Pitch - Mark)

(3) 13 X 17 - K2

(4) 19K (Pitch and Mark)

(5) 9-1/4 X 9 - J

* Calculation formula of the logical boat speed is as below.

^ Boat speed (km/h) = propeller pitch (inch) X engine speed (r/min) X 0.001524 X propeller efficiency / gear ratio.

^ Propeller efficiency = Actual advancing distance when propeller rotated one time / Logical advancing distance when propeller rotated one time.

PROPELLER SELECTION

Depending on a model, Yamaha outboard motors are fitted with the propellers which are chosen to perform well over a range of applications, but there may be the uses where a propeller with a different pitch would be more appropriate.

For a greater operating load, a smaller pitch propeller is more suitable as enables the correct engine speed at WOT (Wide-Open-Throttle) to be maintained.

Conversely, a larger pitch propeller is more suitable for a smaller operating load.

For details, see the WOT operation range table in this chapter.

Besides, select the best matched propeller series which meets with the purpose of use due to a classification and/or kind of boat.

WOT OPERATION RANGE TABLE

With WOT (Wide-Open-Throttle) operation and under a maximum boat load, the engine RPM should be within the upper half of the WOT speed range.

Select a propeller which fulfills this requirement.

2-stroke engines

Global Model US Model Canada Model WOT range (rpm)

2C 4,000 – 5,000

3A 4,500 – 5,500

4AC, 5C, 5CS 4,500 – 5,500

6C 6 4,000 – 5,000

8C 8 4,500 – 5,500

E8D, EK8D 4,500 – 5,500

9.9F, 15F, E9.9D, E15D, EK9.9D, EK15D, EK9.9J, EK15P 9.9, 15 4,500 – 5,500

20D, 25N 20, 25 5,000 – 6,000

30D 4,500 – 5,500

E/25B, E/30H, 25X, EK25B, EK25C 4,500 – 5,500

EK40G, E40G, EK40J, E40J 4,500 – 5,500

E/40X 4,500 – 5,500

40V, 50H 50 4,500 – 5,500

E48C, E55C, 55B 4,500 – 5,500

E60H, 60F 4,500 – 5,500

70B 5,000 – 6,000

55D, E60J, E65A, 75A, E75B, 75C, 85A, 90A 90 4,500 – 5,500

E115A, 115B, 115C, 140B 4,500 – 5,500

130B 5,000 – 6,000

L/150A, L/200A 4,500 – 5,500

150F, 200F 4,500 – 5,500

Z150P, Z175G, Z/LZ200N, Z150Q, Z175H, Z200P VZ150, VZ175, Z/LZ200 4,500 – 5,500

200G, 225D 5,000 – 6,000

L/250G 4,500 – 5,500

 

WOT OPERATION RANGE TABLE

If the engine RPM exceeds the recommended WOT range, replace to a larger pitch propeller.

If the engine RPM does not reach the recommended WOT range, replace to a smaller pitch propeller.

NOTICE

Do not run the engine at the speed which exceeds WOT range, as the engine could cause a damage from overload or over rev.

4-stroke engines

Global Model US Model Canada Model WOT range (rpm)

F2A, F2.5A F2.5 F2.5 5,250 – 5,750

F4B F4A F4A 4,000 – 5,000

F5A, F6C F6A F6A 4,500 – 5,500

F8C, FT8D, F9.9F, FT9.9G F8A, F9.9A, T9.9A F8A, T8D, F9.9A, T9.9A 5,000 – 6,000

F9.9H, F15C, F20B, F20C F15A, F20A F15A, F20A 5,000 – 6,000

F20D, F25D, FT25F F25A, T25A F25A, T25A 5,000 – 6,000

F30B, F40F F40A F30A, F40A 5,000 – 6,000

FT50C, F50D 5,000 – 6,000

F40D, F50F, FT50G, F60C, FT60D F50, T50, F60, T60 F50A, T50A, F60A, T60A 5,000 – 6,000

F70A, F40G F70A F70A 5,300 – 6,300

F95A, F100B 5,000 – 6,000

F75B, F75C, F80B, F80C, F90B, F100D F75, F90 F75A, F90A 5,000 – 6,000

F/FL115A F/LF115A F/LF115A 5,000 – 6,000

F/FL150A, F/FL150B F/LF150 F/LF150A 5,000 – 6,000

F/FL200B, F/FL200C, F/FL225B, F225C, F/FL250A, F/FL250G F/LF200A, F/LF225A, F/LF250 F/LF200A 5,000 – 6,000

F200D, F225D, F250C, F225G, F250F, F275A VF200LA, VF225LA, VF250LA VF200LA, VF225LA,

VF250LA 5,000 – 6,000

F/FL225F, F/FL250D, F/FL300B F/LF225CA, F/LF250CA, F/LF300CA F/LF225CA, F/LF250CA, F/LF300CA 5,000 – 6,000

F/FL300A, F/FL350A 5,000 – 6,000

* The engine rpm at WOT operation will be usually changed about 150 rpm if the pitch of propeller has been changed one inch.

However, the change of rpm varies due to the propeller type, water type (salt or freshwater), boat type (weight or hull shape), etc.

* The maximum engine RPM will increase when the outboard motor is trimmed out.