TinBoats.net
The original aluminum boat site!
Forums
New posts
Search forums
Blog
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Jet Boats
General Jet Boat Discussions
Legal requirements for putting ski motor in Jon.
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support TinBoats.net:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="PSG-1" data-source="post: 379285" data-attributes="member: 6937"><p>I live in SC, so, the rules of my state may be different than elsewhere, so, YMMV. </p><p></p><p> I've got a 160 HP MR-1 engine in my jet boat, which is a Duracraft 1648SV, rated for a 50HP outboard. And the insurance company never even balked at insuring it. Further, I will tell you that throughout my interactions with DNR over the years, I have never seen an officer check a rating plate as it pertains to HP. They will, however, issue a ticket for overloading with passengers. </p><p></p><p>One thing you have to remember about HP ratings on johnboats is that this is based on the engine weight and the amount of torque it applies to the transom. When you go to an inboard, all of this changes. For instance, a 50HP outboard weighs around 205 lbs. And all of that weight is on the transom, hanging off, which puts a lot of stress there, and it makes the stern ride lower.</p><p></p><p>The average jet ski motor weighs anywhere from 100-200 lbs, and because of the jet tunnel, the engine is placed about 2ft forward of the transom, bolted to the floor of the boat. So, the weight has been moved farther toward amidships, toward center of gravity, and since there is no motor hanging off the transom, those stresses are eliminated.</p><p></p><p>Also, because a jet drive is less efficient than an outboard, actual HP at the prop is not the same as an outboard. For instance, an 85HP SeaDoo 717 engine actually produces around 35HP at the prop.</p></blockquote><p></p>
[QUOTE="PSG-1, post: 379285, member: 6937"] I live in SC, so, the rules of my state may be different than elsewhere, so, YMMV. I've got a 160 HP MR-1 engine in my jet boat, which is a Duracraft 1648SV, rated for a 50HP outboard. And the insurance company never even balked at insuring it. Further, I will tell you that throughout my interactions with DNR over the years, I have never seen an officer check a rating plate as it pertains to HP. They will, however, issue a ticket for overloading with passengers. One thing you have to remember about HP ratings on johnboats is that this is based on the engine weight and the amount of torque it applies to the transom. When you go to an inboard, all of this changes. For instance, a 50HP outboard weighs around 205 lbs. And all of that weight is on the transom, hanging off, which puts a lot of stress there, and it makes the stern ride lower. The average jet ski motor weighs anywhere from 100-200 lbs, and because of the jet tunnel, the engine is placed about 2ft forward of the transom, bolted to the floor of the boat. So, the weight has been moved farther toward amidships, toward center of gravity, and since there is no motor hanging off the transom, those stresses are eliminated. Also, because a jet drive is less efficient than an outboard, actual HP at the prop is not the same as an outboard. For instance, an 85HP SeaDoo 717 engine actually produces around 35HP at the prop. [/QUOTE]
Verification
Post reply
Forums
Jet Boats
General Jet Boat Discussions
Legal requirements for putting ski motor in Jon.
Top