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Old 01-27-2019, 10:27 PM   #21
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I didn't spend a lot of time, but did look for anything that said it would be a crime or infraction for exceeding that sticker hp rating and could not find a thing. Might be there but not obvious. As for whether it would void your insurance coverage....not likely at all. Insurance coverage is an entirely different ballgame than whether you're committing some sort of technical offense. Hence why the carriers still have to provide coverage if you're drunk or speeding in an accident.
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Old 01-27-2019, 11:48 PM   #22
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At least for my concerns of overpowering, my lightweight Caribe 9 would barely support the two cycle 9.9 with my modest 250 lbs,, and would easily swamp on any rapid deceleration with a 9.9 four cycle. Max HP rating was 15, I think. My current Walker Bay RIB is 8’10” and is rated at 10 HP, but the folding transom looks much more suited for the 2.3 Honda I’m using instead. I tried the 9.9 but it squats worse than the Caribe and the transom isn’t as tall or as thick. It’s hard to believe you could be overpowered with a 15, but in these smaller dinghies, I can see the potential danger.
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Old 01-28-2019, 12:14 AM   #23
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Wow that was really cool. I've never seen a boat riding on its propeller. Like something out of a James Bond movie.


Hope he's wearing a life jacket for when he eventually flips.
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Old 01-28-2019, 01:55 AM   #24
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Just order the HP sticker you need and change it out on the engine. Pretty easy thing to do. A buddy of mine did this so he could travel up the Colorado below the Hoover Dam for fishing spots. Never got caught and he did catch a few big ones he hunts for. Just dont ask him, those damn fish have grown substantially over the years.
Only Navy would know how to do that!!!!
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Old 01-28-2019, 06:35 AM   #25
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What could possibly go wrong. Surprised the video didn't start with, "Hold my beer and watch this".

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Old 01-28-2019, 07:17 AM   #26
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One might get away legally with a piece of tape on the throttle and a MAX line drawn.

The max line would be the engine de-rated for US waters.

Throttle position is controlled by the boat captain.

Normal on aircraft and choppers.
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Old 01-28-2019, 08:35 AM   #27
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Yes, but how many kids were killed or maimed compared to today. Just because you survived doesn't mean others were as lucky. Plus there are many more boaters on the waterways today than "yesteryear."
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Old 01-28-2019, 08:36 AM   #28
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Personally, if I had a 50hp and the max was 40, I think I'd find a new decal...
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Old 01-28-2019, 08:43 AM   #29
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Yes, but how many kids were killed or maimed compared to today. Just because you survived doesn't mean others were as lucky. Plus there are many more boaters on the waterways today than "yesteryear."
I wonder?
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Old 01-28-2019, 08:45 AM   #30
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Having a steering station appears key to the max HP rating. Some RIB vendors have different ratings for tiller vs console steered boats. But others don't, including AB. The CG regs, which BTW are federal laws, stipulate a formula for max HP rating, and it's different for steering station vs tiller. So that's wy those boats are different.


I suspect in the case of AB, they are just lazy and spec the hull without regard for the installed steering. Perhaps on request they could correct that.


I appreciate all the comments, including the fun ones. I'm pretty conservative when it comes to breaking laws and risk exposure for boating, which is inherently risky to begin with. So even though one could pretty easily get away with having a larger motor, especially if incognito, I agree you would be very exposed if there ever was an accident.


What's behind this is that I'm considering a tender for our boat that has a max rating of 60hp, and that's the same for the open vs console version of the boat. But I have a brand new, never started Yamaha 70 on another boat that I'd like to use.


When I run the CG formula on the open boat, I get 60hp as the max. No surprise there. But when I run the formula on a console variant, I get well over 100hp (I think it was 115hp). That says that if the boat were accordingly rated, a 70hp would actually be a very conservative powering for that boat.
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Old 01-28-2019, 08:48 AM   #31
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I have a Bullfrog 10'. The placard says 15 hp max. Bullfrog sells a version with a steering station and seat, the placard on it says 20 hp max. I enquired, they said the boats are identical, but the CG allows them to put a 20 hp placard on a boat with a wheel and seat. The steering wheel and seat can be installed or deinstalled with a couple of bolts.
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I think remote steering is significant because it moves the weight of the driver to the center of the boat.
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Weight mid-ship is the difference and all recorded as part of their testing.

If you remove the weight, then you need to move to the lower HP.

If you don't then, you reconfigured the product they sold you, without reconfiguring the max hp. So now down to you.
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Yes - agreed. The rating is made based upon the stability of the boat and the loading with standard and max load. When the steering station is moved fwd the load is moved as well.
Our Walker Bay Genesis comes in two versions, too, one tiller and 15-hp max, one wheel and 20-hp max.

WB told us it was about increased weight, different placement of load, etc... as others have said.


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Thought I heard (or read) at some point that difference in HP rating for the steering station vs. tiller configuration is due to the inherent instability on a shorter platform should one lose grip on the tiller at higher throttle settings...
Could be, especially given many are sitting on the tubes with a tiller-steered dinghy... but "inside" at a console. OTOH, WB's story was all about load weight and load placement.


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What is interesting to me is the negligible motor weight difference. Recently bought a new Suzuki outboard for my dinghy. With in the same model class they have 9.9, 15, and 20 HP. They all weigh the same when configured in the same way. Only difference is top end RPM as limited by the engine computer. So in essence, if you run the 20 HP at 300 or 400 RPM off wide open, you have a 15 HP, same weight, same RPM. Other than the engine decals, there's no apparent difference at that RPM.

Used to be different, in that 10/15-hp 2-stroke motors were built on a shared platform, 20/25-hp outboards on a larger shared platform, etc...

But more recently 8/10-hp, 15/20-hp and 25/30-hp outboards have shared their respective platforms...

Suzuki adding their 9.9 to the 15/20-hp platform seemed a bit odd, to me...

Anyway, yes, running the 20-hp version at the same RPMs of a 15 would seem easily possible, but I'd guess it's not difficult to exceed those RPMs even if by "accident"...

But then I'd also guess all the cited downsides to "over-powering" would still apply if something happened to cause deeper investigation.

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Old 01-28-2019, 09:28 AM   #32
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Having a steering station appears key to the max HP rating. Some RIB vendors have different ratings for tiller vs console steered boats. But others don't, including AB. The CG regs, which BTW are federal laws, stipulate a formula for max HP rating, and it's different for steering station vs tiller. So that's wy those boats are different.


I suspect in the case of AB, they are just lazy and spec the hull without regard for the installed steering. Perhaps on request they could correct that.


I appreciate all the comments, including the fun ones. I'm pretty conservative when it comes to breaking laws and risk exposure for boating, which is inherently risky to begin with. So even though one could pretty easily get away with having a larger motor, especially if incognito, I agree you would be very exposed if there ever was an accident.


What's behind this is that I'm considering a tender for our boat that has a max rating of 60hp, and that's the same for the open vs console version of the boat. But I have a brand new, never started Yamaha 70 on another boat that I'd like to use.


When I run the CG formula on the open boat, I get 60hp as the max. No surprise there. But when I run the formula on a console variant, I get well over 100hp (I think it was 115hp). That says that if the boat were accordingly rated, a 70hp would actually be a very conservative powering for that boat.
Which exact RIB and which exact Yamaha 70 are you considering?
Have you been on the Yamaha performance bulletin sites to see what the boat may run like with rated hp?
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Old 01-28-2019, 10:30 AM   #33
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Both of my dinghy's are over the rated hp, our console rib Avon is rated for 25.. it has a 40, our air floor Zodiac is rated 9.9 it has a much beloved 2 stroke 15. The least of my worries is getting cited. the Avon is overpowered.. the dam thing tops out with me solo a tad bit over 40!. The Zodiac feels right. If one abuses the extra HP and thrashes a dink that is over HP then it could most likely lead to issues.



Roll the throttle on responsibly and dont drive like a bonehead in a little over hp shouldn't be a issue.


If your a moron and are in the camp that " I should be able to do anything to it and it wont break or kill me" it's probably smart to stick with the rated HP.


Buy the way.. my kids did use both boats in their adolescences with strict instruction to go easy on it or" it will hurt you".. they both survived.


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Old 01-28-2019, 11:02 AM   #34
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Take the cap plate off and it's likely they will completely ignore that you don't have one(I don't have one on my boat and never been asked about it/dozens of stops).

Or you can legally make your own .

Boat Building Regulations | Boat Warning Labels

Legalities vs liability is muddy and each state has their own statutes so i'm not going to say it's legal everywhere.

You could also just swap the cowling to a lower hp or just take the stickers off.. If they can cite you then at least don't make it easy for them.

I have a 90hp outboard that lost a lower unit/broke a midsection so I used a 75hp midsection/lower(same thing/same company). The serial number says 75 and the cowling says 90 with a 90 powerhead. Totally legal.

You can put a different carb on some tillers to add hp to the next level... The whole thing is stupid.

People getting worked up will probably tell you the FBI will come for you if you take the tag off your mattress.
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Old 01-28-2019, 11:11 AM   #35
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"Take the cap plate off and it's likely they will completely ignore that you don't have one(I don't have one on my boat and never been asked about it/dozens of stops)."

Perhaps where you are - do not come up here and expect the same.
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Old 01-28-2019, 11:19 AM   #36
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I didn't spend a lot of time, but did look for anything that said it would be a crime or infraction for exceeding that sticker hp rating and could not find a thing. Might be there but not obvious. As for whether it would void your insurance coverage....not likely at all. Insurance coverage is an entirely different ballgame than whether you're committing some sort of technical offense. Hence why the carriers still have to provide coverage if you're drunk or speeding in an accident.
In Canada "Capacity Plates" are law for certain size vessels. Not sure the insurance companies pay out on illegal activities.
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Old 01-28-2019, 11:58 AM   #37
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What could possibly go wrong. Surprised the video didn't start with, "Hold my beer and watch this".

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Hey wait a minute!! That could be me and Crusty!!! Hold my scotch Crusty would you please??
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Old 01-28-2019, 01:01 PM   #38
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Yes, but how many kids were killed or maimed compared to today. Just because you survived doesn't mean others were as lucky. Plus there are many more boaters on the waterways today than "yesteryear."
I guess the safest thing is to just never let them out of the house.
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Old 01-28-2019, 01:07 PM   #39
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Weight mid-ship is the difference and all recorded as part of their testing.

If you remove the weight, then you need to move to the lower HP.

If you don't then, you reconfigured the product they sold you, without reconfiguring the max hp. So now down to you.

Don't do it.
Yet this is simplistic enough to be idiotic.

On the Bullfrog, the seat for tiller steered and wheel steered is in exactly the same place, and is exactly the same seat (they simply add a seat back). Weight distribution is what it is, and can be the same in either configuration. It is actually more likely that the weight is further back in the wheel steered, as two people are going to sit behind the wheel, while on the tiller version one will be on the forward seat.

If you don't want to change the placard, there is another solution: buy a new decal for the motor cover. In the Bullfrog case, since any of the big 3 motors are identical between 10 and 20 hp (but for the throttle stop), simply put a 15 hp decal on the 20 hp motor and you're good to go. It would take an engine mechanic with the ability to read out the ECU version to prove you wrong.
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Old 01-28-2019, 01:07 PM   #40
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I guess the safest thing is to just never let them out of the house.
I don't think so - we let our kids out all the time. We just taught them as best we could including to follow the laws.
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