need carburetor help from someone smarter than I

[writtmeyer]

I have a 1996 2hp johnson that sat for a few years without use; thoroughly cleaned carb numerous times, installed new rebuild kit, still will not run without constant choke, and even then I have to constantly balance choke with the throttle. I borrowed a friends carb and it runs fine with it, but cannot see anything wrong with this simple carburetor. I would replace it but it is unavailable, plus can't see what a new one would have that the rebuild kit did not contain. Any suggestions from some smarter or more experienced folks?

 

[cougar1985]

Re: need carburetor help from someone smarter than I

does this carb have adjustable jets atall?maybe float level is incorrect ?

 

[cougar1985]

Re: need carburetor help from someone smarter than I

when i say adj jets i suppose i really mean does it have high or low speed adjustment fuel air screws?to me theres an adjustment out,be it the float level incorrect or a fuel air screw not properlly adjusted.i will run out to the garage and look up what i can and if nobody else chimes in at least i will be on the right page in trying to help,lol

 

[cougar1985]

Re: need carburetor help from someone smarter than I

when i say adj jets i suppose i really mean does it have high or low speed adjustment fuel air screws?to me theres an adjustment out,be it the float level incorrect or a fuel air screw not properlly adjusted.i will run out to the garage and look up what i can and if nobody else chimes in at least i will be on the right page in trying to help,lol

blast it!my manual does not go to 96 so im extremely hesitant to give you any numbers atall but id check the float level and make sure its within specs.did you replace the float or are you using the old one?verify that if your using the old one its not taking on gas as they can get a pinhole over time.sorry i cant help further but im sure somebody else will chime in eventually.

 

[bktheking]

Re: need carburetor help from someone smarter than I

Carb sounds like its dirty still, no adjustments on this bad boy. Thoroughly cleaned means what, everyones definition is different.

 

[writtmeyer]

Re: need carburetor help from someone smarter than I

Thanks for the responses. There are no jet adjustments. By "thoroughly" cleaned I mean soaked for 20 minutes, next time 2 hrs. next time overnight, in Gunk carb cleaner then rinse with water plus spraying orifices with spray carb/throttle body cleaner and blowing out with compressed air.

 

[writtmeyer]

Re: need carburetor help from someone smarter than I

re: float, I used a new one as part of the rebuild kit and when I remove the carb for more cleaning etc. the bowl contains gas, can it be too full? I did not perform any adjustments to the float level.

 

[kenmyfam]

Re: need carburetor help from someone smarter than I

Does seem like there is still a blockage somewhere.

 

[cougar1985]

Re: need carburetor help from someone smarter than I

Carb sounds like its dirty still, no adjustments on this bad boy. Thoroughly cleaned means what, everyones definition is different.

if there are no air fuel adjustments then id look closely at the float,not properly set up can cause lots of grief.

 

[gman223]

Re: need carburetor help from someone smarter than I

check all gaskets and for cracks in the carb, also if it has a needle valve and seat that could be it!

 

[bktheking]

Re: need carburetor help from someone smarter than I

Try setting the float parallel with the carb body while flipped upside down. There are tiny holes just on the inside of the carb throat (at least on most carbs) this one is an oddball, do those holes exist? I suspect not as I dont see welch plugs. Something has to allow for idle.

 

[bktheking]

Re: need carburetor help from someone smarter than I

Thanks for the responses. There are no jet adjustments. By "thoroughly" cleaned I mean soaked for 20 minutes, next time 2 hrs. next time overnight, in Gunk carb cleaner then rinse with water plus spraying orifices with spray carb/throttle body cleaner and blowing out with compressed air.

20 and 2 hrs may have done nothing, once varnish gets in it really plugs stuff up. I had to soak a carb 3 times over night to get it clean, don't no if gunk is good enough either. Opinions?

 

[cougar1985]

Re: need carburetor help from someone smarter than I

20 and 2 hrs may have done nothing, once varnish gets in it really plugs stuff up. I had to soak a carb 3 times over night to get it clean, don't no if gunk is good enough either. Opinions?

ive used motomaster tool and parts cleaner and it cleans the carb in about 2 seconds!its a spray cleaner and since ive never had a carb problem it must work,lol.disassembled it blasts the varnish right off!not sure what the same would be in the states?getting back to the motor if you positive its clean go from step 1 and work down.1 fuel(proper mixture) 2 is the tank clean?3 is the fuel getting to the carb properly?4 and i know im sounding like a broken record make sure your float level is properly adjusted,did your carb kit come with a float level adjustment gauge?check your float drop .for an example on a 2hp colt junior (73-77)the drop is between 1 1/8 and 1 1/2 inch.float drop is the distance between the bottom of the carb body and the bottom of the float at the lowest point .also does this motor have any kind of fuel filter that my be plugged?

 

[backyard mechanic]

Re: need carburetor help from someone smarter than I

You tell us that when you put your friends carb on your motor it runs fine? If that is true, you've narrowed your work down. If yours runs with choke on you are starved for fuel. DUH eh? Well it does tell us something.

Spray carb cleaner in the passages after it soaked in a good quality cleaner over night, blow it out with compressed air, install new parts, set up the float levels including the drop. Next assure a good fuel system is working ie: the pickup tube is clean and set as per spec in the idle tube. Blowing air across the pickup tube will draw fuel (or it should...) Go back to carb 101 and recall your basic carb functions... You don't need a manual for that but for setting it up correctly you may.

Good luck....

 

[writtmeyer]

Re: need carburetor help from someone smarter than I

thanks for the help, will try all suggestions this weekend.

 

[writtmeyer]

Re: need carburetor help from someone smarter than I

Attached is a shot of the exploded carb diagram if it is any help to you all.

thanks again.

 

[cougar1985]

Re: need carburetor help from someone smarter than I

after you redo this weekend or should i say when your doing make sure your needle and seat with that fine wire actually is connected properly i had one slip out on me once and could of drove me batty if it hadnt of dawned on me that maybe i buggered it up some how!dont forget to readjust your idle stop screw either along with everthing else suggested so far,thats so simple a carb it shouldnt be that hard to figure out .any simpler and yuo,d have a mouse sitting there with a spray bottle,lol.

 

[writtmeyer]

Re: need carburetor help from someone smarter than I

thanks for all your lessons on carburetor hygiene; after about 48 hours in the carb cleaner with agitation whenever I thought of it, reassembled and now all working as it should. again, thanks.