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How do i know what the diameter of prop that i need on a 140 hp four-stroke suzuki? I'm trying to order a stainless one off the internet and don't want to order the wrong thing because they will not allow you to return it.
 

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Doyou have one you are trying to replace? Unless you know what was on the baot prior, each boat and motor combination is going to be different as far as prop needs. Your best bet is to stay at one of the local shops (Accuprop or Prop Shop) to find exactly which pitch you'll need. They will let you try and buy and try to set you up with what you need. If you had something to go off of like a prop you had on the boat previously, you could work off those specs to order one. If you buy online, your just going to have to try and sell it or try and return it if it doesn't work out.

But give the specs of the one that is on there and your performance goals (hole-shot or top end speed)and we might be able to help you further. The pitch and diameter of the prop should be stamped on the prop either directly or in the form of a part number. Sometimes that part number is located underneath the prop nut and washer or on the barrel of the prop.

Jon
 

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Propellers are identified by two numbers a 13 3/4 X15 would be a 13 3/4 inches in dia with a 15 inch pitch. Propellers are also measured by inches of pitch. The above propellor would "sqrew" itself 15 inches forward in a compound that would allow the blades to bite and pull without any slippage. Most outboard props have different pitches with a choice available in pitch only. A lower pitch prop is like reduceing the gear ratio in your vehicle. The lower the pitch the easier it is for you vehicle to accelerate.
 

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In a stock Suzuki prop, that motor spins a 14in dia prop. The gear ratio of the Suzuki allows it to swing this large of a prop. In 2007 the Df-140's have an even lower gear ratio than my 2003's.



I have a 14 X 18.5 stainless you can try. this prop was custom tuned. It started life as a 14 X 18.



But be aware that Suzuki prop's are usually 1in to 1 1/2in under pitched from what is stamped on them. One of my 18pitch props was 14 X 16.75 out of the box. I use to be able to remember exactly what they all were from memory, but I have CRS now. I do have it written down some where.



This is what I have found with having 2 set's of props right out of the box. I also know of other people that have found the same thing.





 

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Discussion Starter #5
Hey guys i appreciate the info. but what i was really wanting to know is if there is a way to measure the aluminum prop diameter that is on it now and find out what i need to order.
 

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Take it to accu-prop, and he can tell you exactly what size it is, and the pitch.





X-Shark (10/15/2007)In a stock Suzuki prop, that motor spins a 14in dia prop. The gear ratio of the Suzuki allows it to swing this large of a prop. In 2007 the Df-140's have an even lower gear ratio than my 2003's.



I have a 14 X 18.5 stainless you can try. this prop was custom tuned. It started life as a 14 X 18.



But be aware that Suzuki prop's are usually 1in to 1 1/2in under pitched from what is stamped on them. One of my 18pitch props was 14 X 16.75 out of the box. I use to be able to remember exactly what they all were from memory, but I have CRS now. I do have it written down some where.



This is what I have found with having 2 set's of props right out of the box. I also know of other people that have found the same thing.



Thats interesting! Our boat has a suzuki 140 also and a supposed 14x18 prop. I'll have to get the one on it measured before we order another or have this one re-pitched. As of right now with this prop, 2 people and 35 gallons of water in the bait tank. It will turn 6500 rpms and top out at 36 mph in a 20 ft angler... If it really is a 18 pitch, Im thinking about going to a 19 or 19.5...
 

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jman (10/15/2007)Hey guys i appreciate the info. but what i was really wanting to know is if there is a way to measure the aluminum prop diameter that is on it now and find out what i need to order.
It should be stamped on the prop somewhere. You may have to remove the prop to find the pitch and diameter somewhere near the hub. It's usually marked as 14 x 21 etc... The first number is the diameter and the second is the pitch.

But I found this.<DIV align=center>

Michigan Wheel Ballistic High Performance Stainless Steel Propellers
For Suzuki 90-140 HP
<TABLE borderColor=#336666 cellSpacing=1 cellPadding=1 width="100%" border=1><TBODY><TR><TD width="17%" bgColor=#990000>

Part #</TD><TD width="24%" bgColor=#990000>

Type</TD><TD width="24%" bgColor=#990000>

Size</TD><TD width="10%" bgColor=#990000>

Price</TD><TD width="25%" bgColor=#990000><DIV align=center></DIV></TD></TR><TR bgColor=#f3f3eb><TD width="17%" height=36>335930SUZ</TD><TD width="24%" height=36>Michigan Match Stainless Steel 3 Blade</TD><TD width="24%" height=36>13 5/8 Diameter X 15 Pitch</TD><TD width="10%" height=36>$320.99</TD><TD width="25%" height=36><DIV align=center></DIV></TD></TR><TR bgColor=#ffffff><TD width="17%" height=36>335931SUZ</TD><TD width="24%" height=36>Michigan Match Stainless Steel 3 Blade</TD><TD width="24%" height=36>13 1/2 Diameter X 17 Pitch</TD><TD width="10%" height=36>$320.99</TD><TD width="25%" height=36><DIV align=center></DIV></TD></TR><TR bgColor=#f3f3eb><TD width="17%" height=36>335932SUZ</TD><TD width="24%" height=36>Michigan Match Stainless Steel 3 Blade</TD><TD width="24%" height=36>13 3/8 Diameter X 19 Pitch</TD><TD width="10%" height=36>$320.99</TD><TD width="25%" height=36><DIV align=center></DIV></TD></TR><TR bgColor=#ffffff><TD width="17%" height=36>335933SUZ</TD><TD width="24%" height=36>Michigan Match Stainless Steel 3 Blade</TD><TD width="24%" height=36>13 1/8 Diameter X 21 Pitch</TD><TD width="10%" height=36>$320.99</TD><TD width="25%" height=36><DIV align=center></DIV></TD></TR></TBODY></TABLE></DIV>

Jon
 

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Bring it in to Paradise Marine and we will let you know excactly what prop tho put on it for your boat. If you decide it is the wrong prop we will exchange it for a new on that is correct.

Brad
 

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If you are running an aluminum prop now, and your RPM is within spec, you will want to drop down in pitch if you go with a Stainless. 19 alum- 17 S/S. Take it to Bill at the Prop Shop on Navy Blvd. He has a lot of experience and will treat you right on the price.
 

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Knot a Yacht (10/15/2007)
jman (10/15/2007)Hey guys i appreciate the info. but what i was really wanting to know is if there is a way to measure the aluminum prop diameter that is on it now and find out what i need to order.


It should be stamped on the prop somewhere. You may have to remove the prop to find the pitch and diameter somewhere near the hub. It's usually marked as 14 x 21 etc... The first number is the diameter and the second is the pitch.



But I found this.<DIV align=center>



Michigan Wheel Ballistic High Performance Stainless Steel Propellers

For Suzuki 90-140 HP
<TABLE borderColor=#336666 cellSpacing=1 cellPadding=1 width="100%" border=1><TBODY><TR><TD width="17%" bgColor=#990000>



Part #</TD><TD width="24%" bgColor=#990000>



Type</TD><TD width="24%" bgColor=#990000>



Size</TD><TD width="10%" bgColor=#990000>



Price</TD><TD width="25%" bgColor=#990000><DIV align=center></DIV></TD></TR><TR bgColor=#f3f3eb><TD width="17%" height=36>335930SUZ</TD><TD width="24%" height=36>Michigan Match Stainless Steel 3 Blade</TD><TD width="24%" height=36>13 5/8 Diameter X 15 Pitch</TD><TD width="10%" height=36>$320.99</TD><TD width="25%" height=36><DIV align=center></DIV></TD></TR><TR bgColor=#ffffff><TD width="17%" height=36>335931SUZ</TD><TD width="24%" height=36>Michigan Match Stainless Steel 3 Blade</TD><TD width="24%" height=36>13 1/2 Diameter X 17 Pitch</TD><TD width="10%" height=36>$320.99</TD><TD width="25%" height=36><DIV align=center></DIV></TD></TR><TR bgColor=#f3f3eb><TD width="17%" height=36>335932SUZ</TD><TD width="24%" height=36>Michigan Match Stainless Steel 3 Blade</TD><TD width="24%" height=36>13 3/8 Diameter X 19 Pitch</TD><TD width="10%" height=36>$320.99</TD><TD width="25%" height=36><DIV align=center></DIV></TD></TR><TR bgColor=#ffffff><TD width="17%" height=36>335933SUZ</TD><TD width="24%" height=36>Michigan Match Stainless Steel 3 Blade</TD><TD width="24%" height=36>13 1/8 Diameter X 21 Pitch</TD><TD width="10%" height=36>$320.99</TD><TD width="25%" height=36><DIV align=center></DIV></TD></TR></TBODY></TABLE></DIV>



Jon


Don't even think about putting a undersize diameter prop on it like these. :( The gearing is made to turn a 14in dia prop.



That motor should top out a 6200RPM. At 6500RPM it should be hitting the Rev limiter. The most mine have turned is 6400.



Your going to need a 14X 20. It also depends as to the mounting height of the motor. This will have a effect on the Revs too. She will be a "little" slower out of the hole, but your fuel millage and speed will get better.



I need to see the boat to tell you more about the motor install height.
 
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