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How to find prop pitch?

rastoga I recently put a used yamaha 40 on my boat. I'm just barely in the RPM operating range with a normal load. I'm at 4600 and the operating range is 4500-5500. I'd like to drop the pitch a bit, but I need to know what pitch the current prop is. Are the prop dimensions written on the prop somewhere? It is a stock yamaha aluminum prop. 2001-12-21
Fouled Plug I think you'll find it stamped lengthwise on the hub of the prop. Every drop in pitch theoretically will bump your RPM's up about 200 or so. There are other variables like cupping, diameter, etc. Let us know what you find on your current prop. 2001-12-21
rastoga On the hub there are 3 numbers, they say y-3, G, and 13.

If 13 is indeed the pitch, then the diameter should be 10 3/8. That's the only diameter prop yamaha currently makes with a 13 pitch and aluminum construction. At least that's what they list on their website for use on 40 hp motors.

2001-12-21
rastoga So if it is a 10 3/8 x 13, should I go with a 10 5/8 x 12, or a 11 5/8 x 11? 2001-12-21
J.B. Cornwell If you can borrow a 12, Rastoga, try it out. Another option is to buy a 12 with trade option if it doesn't get you up to about 5,000 with average load.

Otherwise I would go with an 11.

Red sky at night. . .
JB

2001-12-22
araiha Rastoga,

If you can find the yamaha part number, something like 6H5-45945-00-EL, I have a rigging specs manual and can tell you what the pitch is. Normally the number is on the outboard end of the hub just outside the rubber coupler on the prop's frame. Just post the number on this site or email me at [edited]

2001-12-22
Trent Crawford If you dont want to buy a new prop. A prop shop can re-pitch your prop. But I think everyone should have a spare..But heck what do I know.. 2001-12-22
Rex THEY CAN ONLY CHANGE THE PITCH BY 2 DEGREE.
REX A.
2001-12-22
Rex WHERE CAN I FIND A TABLE TO TELL ME THE
YEAR OF THE ENGINE BY RHE SERIAL NUMBER?
REX A.
2001-12-23
araiha I have a yamaha factory rigging specs manual that lists all the part numbers for all their props and the associated pitches. Picked it up on ebay for $25 and worth every penny. 2001-12-23
araiha Your other choice is to go to a yamaha dealer and see if you can talk them out of one of their outboard accessories catalogs. It lists them by part/size/pitch as well. This option is free. 2001-12-23

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