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Jackplate or prop issue?
#3183023
08/03/20 03:09 PM
08/03/20 03:09 PM
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Joined: Oct 2008
Posts: 6,733 Selma
odocoileus
OP
14 point
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OP
14 point
Joined: Oct 2008
Posts: 6,733
Selma
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Brother and I recently bought a NauticStar Bay 1800 from Florida where it spent all it's life on a lift cruising in no wake zones apparently. When the 2007 Yamaha 115 was serviced before we bought it, it had accumulated 270 hours. 190 of those were below 2000 RPM. We noticed that the boat is quick to get on plane, but when you get the trim settled to make the motor happy the boat wants to porpoise. The tach was not working, but I fixed it yesterday. Come to find out, when the boat is happy and not porpoising, it's turning 62-6300 RPM. The motor seems to sit really high on the boat as well. What's the first step too fixing it? Not sure what prop is currently on it. Was going to drop the motor a little, but 15 years of saltwater has me really nervous of the bolts. I put some kroil on one, and put a breaker bar on it, but I was very nervous when I bowed up on it and it barely moved, and didn't feel right (I've broken my share of bolt heads off). Rather pay someone to tackle that project. All of the testing with the boat has been with a full tank of fuel (36gallons) and just me and my brother (hes about 240 and I'm 185).
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Re: Jackplate or prop issue?
[Re: odocoileus]
#3183035
08/03/20 03:25 PM
08/03/20 03:25 PM
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Joined: Jan 2004
Posts: 31,681 Slidell, La
perchjerker
Freak of Nature
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Freak of Nature
Joined: Jan 2004
Posts: 31,681
Slidell, La
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First,what is your water pressure at current height? i always run my motors as high as it will go and st have good water pressure. Dropping it will drop your speed and RPM's. Are you running a 3 or 4 blade ? You'll get better performance out of a four blade. Jumps up faster and stays on top at lower rpm's. Won't run as fast as a three,but in rough water, it won't blow out. a three blade will.
Thomas Jefferson. The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
Life is too short to only hunt and fish on weekends!
If being a dumbass was fatal some of you would be on your death bed!
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Re: Jackplate or prop issue?
[Re: odocoileus]
#3183608
08/04/20 09:34 AM
08/04/20 09:34 AM
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Joined: Oct 2008
Posts: 6,733 Selma
odocoileus
OP
14 point
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OP
14 point
Joined: Oct 2008
Posts: 6,733
Selma
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Well from what I can discover, the boat is only rated for a 115. The prop is a 16 pitch. . Abolt, that's where it seems to be happiest, but that was when the tach was reading over 6k. Not trying to set speed records, just don't want to stress the engine. One thing is for sure, it is a really efficient motor. Apparently the NauticStar bay boats are notorious for having porpoising issues, especially in rougher water.
Last edited by odocoileus; 08/04/20 01:16 PM. Reason: Wrong pitch
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Re: Jackplate or prop issue?
[Re: odocoileus]
#3183786
08/04/20 01:48 PM
08/04/20 01:48 PM
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Joined: Nov 2011
Posts: 10,542
abolt300
Booner
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Booner
Joined: Nov 2011
Posts: 10,542
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https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwj8n6ySmoLrAhXidN8KHRukAw8QFjAVegQIBBAB&url=http%3A%2F%2Fwww.yamahapropselector.com%2F&usg=AOvVaw2reoJgJIIluQIkcxeUKz35
Yamaha has a propeller selector app. Plug in type of boat, motor specs and it'll give you recommendations. I tried to link to the site but it looks like it failed. Just google yamaha outboard prop selector. Diameter of the prop makes a difference in performance as well as pitch.
Last edited by abolt300; 08/04/20 01:50 PM.
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Re: Jackplate or prop issue?
[Re: odocoileus]
#3184265
08/04/20 10:59 PM
08/04/20 10:59 PM
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Joined: Nov 2015
Posts: 12,918 Old Florida
Geno
Booner
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Booner
Joined: Nov 2015
Posts: 12,918
Old Florida
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Make sure the prop is correct or close at least. Get a shop tach and hook to it and run it - no way it's running 6200 or above as it shuts off at 6100. Boat tachs are notoriously inaccurate.
That prop does not appear to have ever been made. Call or email Powertech and they will get you squared away on the prop. They're really great to deal with. 800-736-7767 (toll free), 318-688-1970 (local) or sales@ptprop.com.
Proptech serial numbers are laser engraved and hard to read especially if used in salt water. If it's regular engraved, it's a prop shop id from a rework and should have 2 numbers in this order - diameter and pitch. The number you listed does not have the diameter listed correctly so you'll have to get that figured out (easy to do - just measure it). Then assume it's a 16 pitch and plug your numbers into a prop calculator to see how close you are.
If all else fails - add a set of smart tabs. They will stop the porpoising. I would be concerned about the tach reading though.
Whoever is happy will make others happy too. Anne Frank
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Re: Jackplate or prop issue?
[Re: odocoileus]
#3184412
08/05/20 10:05 AM
08/05/20 10:05 AM
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Joined: Feb 2011
Posts: 10,669 Santa Rosa/Conecuh
hallb
Booner
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Booner
Joined: Feb 2011
Posts: 10,669
Santa Rosa/Conecuh
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I'd try a 4-blade but also on some boats, you aren't going to be able to trim up past 50%. I've always just trimmed out until it's running good and running the proper RPM's. In your case, that motor is probably supposed to be in the 5000-6000 RPM range. Sure, you can always go higher than that by getting your prop out of the water. Basically if you can trim it out and hit that RPM range, you are good. Anything else you do from there is to try and get more speed, more hole shot, etc.
edit: just read your post a little closer - you should raise your pitch to lower RPM's. Also, a 4 blade might do the same thing, but you still might need different pitch. 4 blade is for hole shot and not blowing out when trimmed, 3 blade is for more speed. I've owned multiple pathfinder, blazer bays, scouts, a blackjack, etc. Been thru the prop thing with a bunch of them. Never assume the guy that had the boat before you had the right prop on there. Down here on the coast, you can generally find a buddy with a prop to let you try out or a prop shop that will let you try different ones until you find what works. You can also have a prop shop do some tweaks on it to change the pitch a little.
Last edited by hallb; 08/05/20 10:20 AM.
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Re: Jackplate or prop issue?
[Re: odocoileus]
#3185038
08/06/20 11:01 AM
08/06/20 11:01 AM
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Joined: Nov 2015
Posts: 12,918 Old Florida
Geno
Booner
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Booner
Joined: Nov 2015
Posts: 12,918
Old Florida
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Good deal - closing in on it.
Whoever is happy will make others happy too. Anne Frank
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Re: Jackplate or prop issue?
[Re: odocoileus]
#3185986
08/07/20 02:18 PM
08/07/20 02:18 PM
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Joined: Oct 2008
Posts: 6,733 Selma
odocoileus
OP
14 point
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OP
14 point
Joined: Oct 2008
Posts: 6,733
Selma
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Well as we were getting the boat ready to test the tach, trim went out. It had gotten a little slow on us before but the fluid was low. Figured I'd be having to put seals in it before long. As luck would have it, the manual tilt bleed screw is seized tight, and has been for some time. A previous "mechanic" boogered the slot on the screw head up for me. Nothing for the impact screwdriver to bite. No way to get anything in there to make a new slot. Left hand drill and ease-out time. Oh the joys of owning a boat.
It gets even better. That manual release screw is $149.99 factory Yamaha part. Aftermarket is $75. Just great.
Last edited by odocoileus; 08/07/20 02:28 PM.
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