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Prop?

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nccatfisher

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I just bought a new 25 HP Yamaha, my first small 4 stroke. It came with a 9 7/8 X 10 prop on it. As I mentioned I am totally new to small 4 strokes but have had numerous small two strokes that size. I am going to run it on a 1448 Grizzly AW with two batteries, about 30# of anchors and a 30 gal bait tank. I have both batteries and the fuel tank up under the front deck and the bait tank will be right behind it. I have done my best to keep weight distribution as even as I could.

My question unless I am badly fooled this prop is going to have that thing bumping against the rev limiter if it has one if I was dumb enough to run it that way. Does anyone have any suggestions for a prop size for me to start with that will ultimately put it right in the 5500-6K range WOT with a similar boat in this load range? I am not a continual WOT type of guy myself, I would like to prop it ultimately so it will be most efficient but I usually run one in the 4K range cruising or just slightly better unless I am trying to get in to avoid a wet butt occasionally.
 
As you mentioned you bought the motor brand new... Contact the dealer and tell them you are not sure how this prop will perform given your load and you want to take it out and run it with that prop to see what happens or tell them they can take the boat and run it and see what happens. The dealer who sold you that engine obviously want's to make you happy (and service it for years to come). They will usually tell you to run the boat, don't ding the prop, and if stock performance isn't where is should be they'll replace it with another free of charge until you find the correct prop for your application. A quality dealer will let you swap props over and over until you find the right one for your boat. It's either that or they can spend their time trying different props to reach the correct WOT RPM. They have better things to do than that.
 
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deepsea21 said:
As you mentioned you bought the motor brand new... Contact the dealer and tell them you are not sure how this prop will perform given your load and you want to take it out and run it with that prop to see what happens or tell them they can take the boat and run it and see what happens. The dealer who sold you that engine obviously want's to make you happy (and service it for years to come). They will usually tell you to run the boat, don't ding the prop, and if stock performance isn't where is should be they'll replace it with another free of charge until you find the correct prop for your application. A quality dealer will let you swap props over and over until you find the right one for your boat. It's either that or they can spend their time trying different props to reach the correct WOT RPM. They have better things to do than that.
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I asked, they are three hours away. His exact words were " they must have figured it was going to be used by a boat full of Japanese commercial fishermen full of nets" :( I asked if he had any other pitch props for it in stock. He said no, but we can order anything you want.

I pretty much knew I was on my own then.
 
Well, new props are worth $ and larger service centers have piles of new or referb'd props laying around and in stock. Any reputable, local dealer will offer you $ for that prop if you elect to purchase a replacement from them that they have in stock and suits your needs. They won't offer retail price credit against another but they'll give you something for it and let you try all the other props they may have in stock or may need to order that is a good match for your needs.
 
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