61 Lo boy fuel issue

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Masmith
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Zip Code: 40165
Tractors Owned: 1961 International Lo Boy, 1961 F Cub, 1948 F Cub.
Location: Shepherdsville, KY

61 Lo boy fuel issue

Postby Masmith » Wed Jun 06, 2018 1:15 pm

I brought home a decent running 1961 Lo Boy and have used it for about two hours. It was running a little ruff but has now began idle surging very low to high. It runs fairly smooth at full throttle with half choke. I got out the manual and attempted to adjust the idle screw without success. This will be the first cub carburetor I've attempted to work on. All my past experience has been with the cadet carter carbs. Any suggestions or other things to look for would be a big help.

Thanks,
Mike
Mike

Eugene
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Zip Code: 65051
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Re: 61 Lo boy fuel issue

Postby Eugene » Wed Jun 06, 2018 1:32 pm

Sounds like a fuel flow issue. Just have to start checking at the carburetor, sediment bowl, fuel tank inlet.
I have an excuse. CRS.

Cubfriend
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Tractors Owned: 1948 Cub, Kittie; 1948 Cub, Harold; 1949 Cub, 49er; 1951 Cub, Tucker; 1951 Cub, Homely; 1956 Cub High Crop; 1957 Cub Loboy; 57 Cub Loboy w/fasthitch + 194 plow; 1958 Cub LoBoy w/FH, Popeye; 1961 Cub, Beater; #1-1962 Cub Loboy Dually (Originally Orange) w/Foot Throttle; #2-1962 Cub Loboy Dually (Originally Orange) w/Foot throttle; Yellow 1963 Cub Loboy and blade; 1970 Cub, Cubbie; and 5 other Cubs in various stages of disaasembly and disrepair; 1962 Cub Cadet Original; 2 other Cub Cadet Originals; Cub Cadet 100; Cub Cadet 124 w/Creeper; Cub Cadet 147; 2 Cub Cadet 129's; Cub Cadet 149; 1948 Allis Chalmers C w/single frontwheel; 1944 Formal H w/Tokhiem Cab; 2 One Point Fasthitch Carriers; #100 Fasthitch Rear Blade; 2 Sets Cub 144 Cultivators; 2 Sets Cub 252 Cultivators; 3 Cub 193 Mouldboard Plows; 1 Cub 193 Slatted Plow; 1 1948 Cub-54 Snow Plow; 3 Cub-54 49-5 Snow Plows; Cub #6 Tool Bar w/Disc Blades & Middlebuster.
Circle of Safety: Y
Location: Grand Island, Nebraska

Re: 61 Lo boy fuel issue

Postby Cubfriend » Wed Jun 06, 2018 2:28 pm

I would think you could check the little brass hex head jet on the side of the carburetor bowl for rust and junk. Don’t use anything that would alter the hole sizes in the jet. A small copper wire and some air should open them up. (Telephone wire works good) Wear your safety googles when using air pressure.
Frank

ntrenn
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Tractors Owned: 63 Cub 221833 in family since '69
65 Lo-boy 19648 with an un-stuck #4 - it lives!!!
144 Cultivators with disc hillers
193 Plow
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Location: Indiana

Re: 61 Lo boy fuel issue

Postby ntrenn » Wed Jun 06, 2018 6:08 pm

Also pull the pipe plug out of the bottom of the carb bowl...it should flow a good stream....not trickle. That checks the max supply ability if the system. I have had the bowl fill with water enough to stop fuel from getting through...removing the plug clears the water...


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