Jump to: 

 

 

 

 

 

 

 

 

 

 

 

 

 

UNDER NO CIRCUMSTANCES SHOULD YOU EVER USE A PROP WHICH WILL ALLOW YOUR OUTBOARD TO OPERATE ABOVE THE OUTBOARD'S RECOMMENDED MAXIMUM RPMs!

*Definition of Loads

  Light:  100-500 lb.
  Moderate:  500-1500 lb.
  Heavy:  1500-3000+ lb.

Tohatsu Outboard Propeller Chart

Propellers have two basic dimensions; diameter and pitch. Diameter is the distance measured across the propeller hub line from the outer edge of the circle that is made by the propeller's blades during rotation. Pitch is the distance that a boat will travel if rotated one revolution without any slippage. When describing a propeller both the diameter and pitch are given. The diameter is referenced first and the pitch is second. Therefore, a 12" x 9" propeller would have a 12-inch diameter and a 9-inch blade pitch.

Theoretically, a propeller with a 14-inch pitch, when rotated one full turn, would advance a boat 14 inches through the water. In reality, no 14-inch pitch blade will advance a boat 14 inches with one full turn. This variance is referred to as slippage.

In general, changing to a higher pitch prop will increase your top-end speed but reduce your acceleration (reduce your "hole-shot" power). On the other hand, decreasing the pitch will increase your hole-shot but sacrifice some of your top-end speed. If the hole-shot speed is important to you, for example if you pull water skiers most of the time, then you would want to go with a lower pitch prop and sacrifice some of your top-end speed but increase your hole-shot speed to get the skiers up faster.

UNDER NO CIRCUMSTANCES SHOULD YOU EVER USE A PROP WHICH WILL ALLOW YOUR OUTBOARD
TO OPERATE ABOVE THE OUTBOARD'S RECOMMENDED MAXIMUM RPMs!

The propeller selection chart can be used to help you in selecting the correct propeller for your Tohatsu outboard. Remember that in any application, discrepancies in performance can result due to the different boat hull designs, the final carrying load and your particular needs.

NOTE: It is highly recommended that the outboard be checked with a tachometer to ensure that the engine is operating within the correct MAXIMUM RPM RANGE.

OUTBOARD PROPELLER CHART
Models Load* Dia Pitch # Blades Standard
Equipment
Tohatsu Part #
 MFS2/MFS2.5/ MFS3.5
(
4-Stroke)
Light 7.4 7 3 3F0641010M
  7.4 6 3 (aluminum) 3F0B645120
Moderate to Heavy 7.4 5.7 3   309641060M
Heavy 7.4 4.5 3   314B641030
 M2.5A & M3.5A
  (2-Stroke)
Light 7.4 7 3   3F0641010M
  7.4 6 3 (aluminum)
"A" model 2-str. only
309B641070
Moderate to Heavy 7.4 5.7 3 309641060M
Heavy 7.4 4.5 3 (recommended for 2.5 only) 314B641030
 M3.5B
  (2-Stroke)
Light 7.4 7 3   3F0641010M
  7.4 6 3 (aluminum) 3F0B645120
Moderate to Heavy 7.4 5.7 3   309641060M
 MFS4 / MFS5 / MFS6
(
4-Stroke)
Light 7.9 9 3   369B645181
Moderate 7.7 8 3 (5hp & 6hp) 3R1B645161
Heavy 7.7 7 3 (4hp)  3R1B645141
  7.9 6 3   393B645121
  8.375 6 3   (6hp Sail Pro model) (high thrust) 399B645121
 M5B
 
(2-Stroke)
Light 7.9 9 3   369B645181
Moderate 7.7 8 3 3R1B645161
Heavy 7.7 7 3   3R1B645141
  7.9 6 3   393B645121
 M8 & M9.8
 
(2-Stroke)
Light 8.5 9 3 (short shaft) 3B2B645170
Moderate 8.5 8 3 (long shaft) 3B2B645151
  8.9 7 3   3B2B645140
 Heavy 8.7 7 4 (high thrust) 3B2B645120
  8.3 6 3   3B2B645126
  8 5 3   3B2B645125
  8.7 5 4 (high thrust) 3B2B645110
 MFS8 & MFS9.8
 
(4-Stroke)
Light 8.5 9 3   3B2B645170
Moderate 8.5 8 3 (9.8hp short shaft) 3B2B645151
  8.9 7 3  (8hp ALL
9.8hp long shaft)
3B2B645140
Heavy 8.7 7 4 (9.8hp long shaft w/ power tilt)
(high thrust)
3B2B645120
  8.3 6 3   3B2B645126
  8 5 3   3B2B645125
  8.7 5 4 (9.8hp ultra-long shaft)
 (high thrust)
3B2B645110
 M9.9 / M15 / M18
 
(2-Stroke)
Light 9.25 10 3   362B641080
  9.2 9 3 (18 ALL
9.9/15 short) 
362B641010
Moderate  9.25 8 3  (9.9/15 long shaft) 3BAB645161
  9.2 7.8 3   362B641030
Heavy 9.2 6.9 3   362B641050
  10 7 4 (high thrust) 3Z0B645143
 MFS9.9 / MFS15 / MFS18 / MFS20
  
(4-Stroke)
Light 9.25 11.5 3   3BAB645241
  9.25 10 3 (15/18/20 short shaft) 362B641080
  9.2 9 3 (9.9 short
15/18/20 long shaft)
362B641010
 Moderate 9.25 8 3  (9.9 long shaft) 3BAB645161
  9.2 7.8 3   362B641030
Heavy 9.2 6.9 3   362B641050
  10 7 4 (high thrust) 3Z0B645143
 M25 & M30
 
 (2-Stroke)
Light 9.9 14.2 3   349B645291
  9.6 13 3 (short shaft) 3R0B645270
Moderate 9.8 12 3   3R0B645250
  9.8 11 3 (long shaft) 3R0B645230
  9.7 10 3   3R0B645210
Heavy 9.8 9.3 3   3R0B645180
  10.2 8.3 3   346B641065
 MFS25 & MFS30
  
(4-Stroke)
Light 9.9 14.2 3   349B645291
  9.6 13 3   3R0B645270
Moderate 9.8 12 3   3R0B645250
  9.8 11 3   3R0B645230
  9.7 10 3   3R0B645210
Heavy 9.8 9.3 3   3R0B645180
  10.2 8.3 3   346B641065
 M40C
  
(2-cylinder)
Light 11 15 3   3T5B645320
  11.1 14 3   3T5B645290
  11.1 13 3   3T5B645270
Moderate 11.4 12 3   3T5B645250
  11.6 11 3   3T5B645230
  10.8 9.9 3   361B641091
 Heavy 11.2 8.7 3   348B641071
  11.4 7.1 4   348B641081
 M40D & M50D
  (3-cylinder)

 MD40 & MD50
 
(TLDI)

 MFS40 & MFS50
 
(4-Stroke)
 

Light 11 15 3   3T5B645320
  11.1 14 3   3T5B645290
Moderate 11.1 13 3   3T5B645270
  11.4 12 3   3T5B645250
Heavy 11.6 11 3   3T5B645230
  12.1 9 3   3T5B645180
  11.2 8.7 3   348B641071
  11.4 7.1 4   348B641081
 M70A & M70B
 (2-Stroke)
Light 10.9 17.6 3   353641090M
  10.7 16.4 3   353641080M
Moderate 11.5 13 3   353B641050
  11.6 12 3   353B641040
Heavy 11.5 11 3   353641030M
  11.5 10 3   353641020M
  12 9 3   353641010M
 M70C / M90
 (2-Stroke)

 MD70 / MD75 / MD90
 
(TLDI)

Light 12.75 21 3   3N4W645451
  13.2 21 3 RUBEX** 9999RUBA321M
  13 19 3   3N4W645411
  13.2 19 3 RUBEX** 9999RUBA319M
  13.25 17 3   3N4B645361
  13.25 17 3 RUBEX** 9999RUBA317M
Moderate 13.25 16 3   3N4B645341
  13.75 15 3   3N4B645321
  13.5 15 3 RUBEX** 9999RUBA315M
Heavy 14 13 3   3N4B645271
  13.75 13 3 RUBEX** 9999RUBA313M
  14 11 3   3N4B645231
 M115 & M140
 
 (2-Stroke)
Light 12.75 21 3   3N4W645451
  13.2 21 3 RUBEX** 9999RUBA321M
  13 19 3   3N4W645411
  13.2 19 3 RUBEX** 9999RUBA319M
  13.25 17 3   3N4B645361
  13.25 17 3 RUBEX** 9999RUBA317M
 Moderate 13.25 16 3   3N4B645341
  13.75 15 3   3N4B645321
  13.5 15 3 RUBEX** 9999RUBA315M
Heavy 14 13 3   3N4B645271
  13.75 13 3 RUBEX** 9999RUBA313M
  14 11 3   3N4B645231
MD115
  (TLDI)
Light 12.75 21 3   3HKB645450
  13.2 21 3 RUBEX** 9999RUBA321M
  13 19 3   3T1B645410
  13.2 19 3 RUBEX** 9999RUBA319M
  13.25 17 3   3T1B645360
  13.25 17 3 RUBEX** 9999RUBA317M
 Moderate 13.25 16 3   3T1B645340
  13.75 15 3   3HKB645320
  13.5 15 3 RUBEX** 9999RUBA315M
Heavy 14 13 3   3T1B645270
  13.75 13 3 RUBEX** 9999RUBA313M
  14 11 3   3T1B645230

**RUBEX: Rubex style aluminum props provide reduced noise over standard aluminum props. Rubex props require a "hub kit" (part #9999RUBAHUBM). The hub kit fits all Rubex props and allows one hub kit to be used with different pitch props.

The selection of the correct propeller will allow the engine to obtain it's full RPM as well as the designated horsepower. Engine horsepower is very closely related to the RPM that the outboard can obtain. In other words, if the outboard can not reach its specified RPM, it cannot reach its specified horsepower. We hope that this selection chart helps you in making the right decision when choosing a propeller for your Tohatsu outboard.

STAINLESS STEEL PROPS
Models Dia. Pitch Blades Part #
25/30
(2-Str & 4-Str)
10 9 4 NM889110109
10 10 4 NM889110110
10 8 3 NM889010108
10 9 3 NM889010109
10.125 10 3 NM889210100
10.125 11 3 NM889210110
10.125 12 3 NM889210120
10.125 13 3 NM889210130
 40 - 50
 (all 3-cylinder models)
10.75 11 3 PT4050P11
10.5 12 3 PT4050P12
10.5 13 3 PT4050P13
10.5 14 3 PT4050P14
10.5 17 3 NM889410170
60A/70A/70B 11.75 15 3 NM889510150
11.75 17 3 NM889510170
60C/70C/90~140
(2-Str & TLDI)
13.25 14 3 PT70115P14
13.25 15 3 PT70115P15
13.25 17 3 PT70115P17
13.25 18 3 NM889610180
13.25 19 3 PT70115P19

Propeller Hardware Kits include the thrust holder, washer, nut and split pin.

PROPELLER HARDWARE KITS
Part Number Applicable Models
3H6873260M M4C/5B
MFS4/5/6A & A2 & B & C
3V1873261M M8/9.8B
MFS8/9.8A & A2 & A3
3V9873260M M9.9/15D2/18E
MFS9.9/15/18/20 B & C
3R0873260M M25C3/30A4
MFS25/30A & B
361873260M M40C
3T5873260M M40/50D2
MD40/50B

For hardware kits for models not listed, please contact your local dealer.

 
 
© Tohatsu America Corp. All rights reserved.
Website by WebEnvy