Got a 2hp Honda outboard with my new Sea Pearl Trimaran. Starts and idles fine, increases rpm's a little bit fine, but when I open the throttle it stumbles and stalls. I can play with the choke and get it up to full rpm with about 1/2 choke and it will usually continue to run at full rpm's if I push the choke off. What do people think are the possible causes? I'm thinking fuel delivery problem. It's running too lean, that's why it will power up with some choke. Could be a plugged fuel filter (in the tank), or perhaps dirt in the carb jet. Anyone have any other hypotheses? Would a bad plug cause that symptom?
I took the carb drain screw out and sprayed in a lot of carb cleaner. Problem remains.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Sounds like the motor's been sitting a while. Idles good and wont rev up with any power. My experience with that is that your carb needs to be disassembled and the jets/passages thoroughly cleared from the gunk that old gas leaves in there. Just flushing with carb cleaner doesn't cut it. Use some fine copper wire to run through the jets. You can boil the carb body in a pot of water to clear out the small passages. Boil it a while! Replace any gaskets you tear up.
That's what I would do.

Take the In/Out Fuel lines of the Carb and Forcibly Blow Valvoline Synthetic
Carb cleaner Through. (B12 Chemtool is an alternate)
Let It Soak for 24 Hours.
Then fill the Carb System with AeroKroil ,Let it sit for 4 Hours Minimum.
Empty
And Fill with Clean Fresh "Pri-G" treated 89 Octane Non- Ethanol Fuel.

Problems are History!

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'84 300SD sold
124.128

Filled the carb with b-12 carb cleaner and will let it sit over the weekend. Fuel flowed freely out of the drain hole when the plug was removed and valve turned on so the filter must not be plugged.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

I wonder if it has an idle and low-speed jet, which may be functional, and another jet for higher rpm running, which may be partially-clogged.

A few things i learned from my son's dirt bike days.....Yamaha carb cleaner is the bomb, jet removal is easy without buggering if you warm them up gently with a propane torch. You have to remove the jets and soak, clean, then blow everything out w/compressed air.

I have a honda 5 hp that did the same thing. A piece of gunk was blocking the main jet. I used a small needle and carb cleaner to push it out. It has been running awesome ever since.

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1979 240D with a 617 turbo diesel.

I am not familiar with that engine but because of the size I wonder if it has a diaphram type carburetor. If so, buy the carb kit or even the whole carb from the manufacturer and skip Honda.

Not sure what a diaphragm carburetor is. Can you explain. It does have a plate on top that looks like it might be a cover on a diaphragm.
It has one adjustable jet. Don't know if it's the main jet. I assume so. I took it out and sprayed carb cleaner thru it. Then I finally adjusted it one turn further out than it was when I got it and it seems to be running ok now. Don't know if I cleaned some crap out with the spray or if it was just turned too far in to begin with.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

http://www.aerocorsair.com/id150.htm

Didn't read this whole page, it was high on the google returns.

I know you could have found this easier than asking. Was this a passive-aggressive correction of my spelling error?

Didn't even notice your spelling error.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13