zz28zz, thanx for that info.. I`m in hvac so I got all that power/ hard start covered .

LakeBoat4.
Pretty much what I wanna do.. where did you put the exhaust relative to the water line ?
Any vibrations that you can feel while it`s running .
I have tons of space in this cat, lots of room in front of the engines too . Finding a spot shouldn`t be a problem.

The exhaust outlet is on the transom about 6-8 inches below the waterline. No real noise except for the bubbling sound. The stainless loop goes up about a foot over the exhaust outlet on the generator.then down to the transom fitting below the waterline this keeps it cool as well. The generator is mounted on a fiberglass cover that is over the batteries and pumps which absorbs any vibration that the rubber feet on the honda doesn't.It all works Great. You do need to chock the Honda to get it to start on the first pull.the carb is not electronic.

Not my boat but done the same way

This is my boat without the Generator, Using it at the dock. You can see the exhaust tube

I have a 9 kw diesel generator on my trawler and it’s great at anchor when you’re running the house with 3 a/c units a full size fridge/freezer and indirect stove top along with the water heater and washing machine. Gotta turn off the water heater to run the dryer.

But at night when I’m only running the forward stateroom a/c and the frig/freezer I am only using 1000-1500 watts after startup. Generator still burns 1/2 -3/4 gallon an hour where I can get the Honda 3000 to idle a 10 hour night on 2 gallons with none of the noise or vibration of my diesel generator.

Its up on my top back deck where it can’t asphyxiate us and is so quiet you can’t even hear it on the lower deck.

That exhaust tube runs through the transom unwaterjacketed ?

I am pretty certain that I would not want my insurance company knowing that you are putting a non Coast Guard rated anything under the hatch. It does not seem like a good idea.

You the insurance Man, You know installation code. WTF? Inlighten this Dumb Ass.


Guess it is not OK to refuel the generator on the boat ether. Is it even OK to have a portable generator on a boat at all even on the swim platform?


Guys blow up boats from fuel vapors but I have never heard it was pertaining to a Honda generator installation for that or a fire hazard to begin with. You want to water jacket the exhaust tube , go for it.


Been around boats for years. There are many things that "maybe asked" about a Honda but this does work and for more than a few years for more than a few of us. The reason is that the bullhead fitting acts as a cooler that is subject to the ambient water outside the hull. Don't what to get the coast guard involved as this boat has never seen a coast. Besidesides this boat is only inland lake use never seen the CG on the waters I boat in.

They sell Silicone exhaust kits .. maybe the exhaust isn`t so hot?

There was a guy that mounted his Honda EU2000i in the bilge of his 37AT. He would crack the engine hatch, and had welded an exhaust to a through-hull setup.
I have an EU2000i, and even though I rarely use it, I don't see selling it. It's too handy. I used it on my 37AT on the swim platform as Russ described above.

Dan, I often run my Honda 2K inverter generator for power outages, and it's a work horse.

I run it on the throttled option 99%.of the time. When a fridge or freezer starts up when it's already loaded up, the rpm kicks up for a bit to compensate, then dies down again.

I couldn't imagine the 1K W system. Motor startup for an A/C may even affect the rpm even as the solo load.

The 2K unit is just a reliable workhorse that sips fuel, while having some backup wattage if you need it.