boat motor question

[hunter]

I have a 2000 30 horse tohatsu. Some might say should have bought a better name brand but it has always run great for me. I use gas treatment and normally run the gas out after every use but I feel that the ethanol gas might have messed me up-don't know though

I took it out to run it and it would only run full speed on half choke. It wouldn't run under a load on no choke. It idles great though.

I put new non-ethanol gas in it, checked the fuel filter, and pulled off the carb, took it all apart, cleaned the jets, blew out everything with my air hose. I didn't really see any problems except for a few small holes that were clogged in one of the jets. I didn't touch the screws on the carb.

I took it out today and it wouldn't take off under load with no choke, but once it got going full speed on half choke I could take the choke off and it would run on no choke but not at as fast as half choke.

I was thinking that maybe I need to just buy a carb rebuild kit or maybe I have some trash where the carb screws are located.

Any suggestions?

Thanks for the help

[BR549]

sounds like your low speed jet is stopped up. Your high speed is fixed but your low speed is adjustable. This will cause a lean runnin condition and can burn a piston! This needs to be fixed asap!

[Scully]

Nothing wrong with a Tohatsu/Nissan. My guess is fuel system related. Try running some seafoam first- if it doesnt work, you havent lost anything. I would move on to the carbs from there. Thats my guess- for what its worth.

[Faithful Retrievers]

My buddy has the same motor had some problems after it sat up for a while. Took it had the carbs gone through and runs like a top.

[hunter]

sounds like your low speed jet is stopped up. Your high speed is fixed but your low speed is adjustable. This will cause a lean runnin condition and can burn a piston! This needs to be fixed asap!

I guess that the single screw on the carb is what controls the low speed jet. I pulled the two jets out and blew both the jets and the carb out with an air hose. Should I just remove the screw and clean it out agian?

thanks for the help

[jdbuckshot]

pull the carb, disassemble and drop it in a gallon of chem dip for a day. blow dry with air hose and re assemble. should fix you right up.

JD

Check your fuel lines and be sure the inside liner isnt cracked and getting into your gas.

[BR549]

sounds like your low speed jet is stopped up. Your high speed is fixed but your low speed is adjustable. This will cause a lean runnin condition and can burn a piston! This needs to be fixed asap!

I guess that the single screw on the carb is what controls the low speed jet. I pulled the two jets out and blew both the jets and the carb out with an air hose. Should I just remove the screw and clean it out agian?

thanks for the help

Actually what JD said is best. The carb needs dissasembling completely and soaked in a carb chemical cleaner if possible then blown out with compressed air. If you pulled the jets then you had to have moved the low speed jet setting? Another thing he said if you think you have an ethanol/alchohol issue your fuel line could be bad! Black rubber fuel lines and alchohol do not get along! You need a "alchohol" proof fuel line these days which will be gray in color. In any event make sure you clean your tank out and CLEAN or REPLACE your fuel line BEFORE pumping any fuel into your clean carbs! I've seen this over and over again. People would clean the carb then pump their problem right back into them! Bout the third time when they finally bring it to the shop and all you do is change the fuel line and flush the carbs they get pizzed! Also unless you plan to lay your motor down or on it's side DO NOT DRAIN OR TRY TO RUN ALL THE GAS OUT OF THE CARBS!!!!!!!! You cannnot run it all out and this can actually lead to more problems down the road. This is an old myth just like the stainless prop issue!

[hunter]

I dipped the carb in a cleaning solution but now I can't get it to run right. What is the best way to adjust the carb?

There is only 1 screw on the carb and I turn it but it just doesn't want to run correctly. I think that when the screw is all the way in it is running lean and as it is screwed out it runs richer-judging by the amount of smoke anyway.

No matter how much I adjust it it doesn't want to idle and it is sluggish on acceleration. The only thing that I can think of doing would be to buy some new spark plugs and try that.

any suggestions

[BR549]

I dipped the carb in a cleaning solution but now I can't get it to run right. What is the best way to adjust the carb?

There is only 1 screw on the carb and I turn it but it just doesn't want to run correctly. I think that when the screw is all the way in it is running lean and as it is screwed out it runs richer-judging by the amount of smoke anyway.

No matter how much I adjust it it doesn't want to idle and it is sluggish on acceleration. The only thing that I can think of doing would be to buy some new spark plugs and try that.

any suggestions

Well if you got your carb clean, usually open your air/fuel mixture screw about a round and a half. Once motor is running and warmed up you can adjust from there. Yes screwing it in leans it out and out richens it up. You say it's still not running right, do you have it in a tank of water or trying to run it on a hose with muffs? Some of these motors must have back pressure on them in order to set the carbs. Takes a very good ear to set one of those on a hose!

[hntrpat1]

Try new plugs too. But it sounds like crap in the carb

[hunter]

Yes I am trying to set in on a hose. I will try it in a tub of water and just see.

I sure hope I don't have stuff in the carb again. I am about tired of this. I was hoping the third time I pulled it off I would have fixed it.

[BR549]

Yes I am trying to set in on a hose. I will try it in a tub of water and just see.

I sure hope I don't have stuff in the carb again. I am about tired of this. I was hoping the third time I pulled it off I would have fixed it.

Cleaning carbs can be tricky at best! All it takes is one little bit of trash in the right place. Usually have to take something like a torch tip cleaner or some pipe cleaners to be sure you get all the orifices clean. Then blow everything out real good with compressed air. Once you get the motor set what you think is about right try quickly advancing the throttle. Be careful not to overrev an unloaded engine! If the motor tries to backfire (leanpop) it's still to lean! Sometimes it's real simple but sometimes it can be agravating!

[hunter]

I did clean out the individual holes on the two jets with something similar to a torch tip cleaner. there were only 2 or 3 of really small holes that were clogged up though

[stevea]

make sure there is not a leak in the fuel line or conections could be sucking air

[hunter]

make sure there is not a leak in the fuel line or conections could be sucking air

yeah I checked that-thanks though