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#1
09-22-2012, 09:05 PM
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The 123 is acting up.......................
A couple weeks ago it started ...stalling. Applying choke and cranking would get it started again.
Then it started to run only with the choke on. More and more stalls. So...a new carb kit. New Fuel lines, clean the gas tank, clean the sediment bowl/screen. Nada...same thing. It's definitely fuel related. The only other thing I can think of that I didnt check when I rebuilt the carb was the float setting. It almost seems like its running out of gas. When I give it a few seconds for the bowl to fill back up it runs fine. Oh...If I run the throttle LOW, it'll run pretty well (which coincides with the "running out of fuel" theory. Any other ideas, my IH brothers? John 
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61 and 63 Originals 123 (2) 782D 106, 147, 122 102 parts It's only original ONCE!
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#2
09-22-2012, 09:26 PM
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My 125 was doing the.same exact thing. so I redid the carb as well. Out of anything to think of I decided to change the coil and condenssor it runs perfect now. If you have another tractor to rob the parts off of for testing purposes I would give it a shot. I just did it yesterday and now I can mow my entire yard which takes about 2 hours without it messing up once.
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No more cubs. But never fear there will be more     
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#3
09-22-2012, 09:42 PM
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Do you have enough fuel in the tank? I was having problems on mine and realized it didn't have enough fuel in it....
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Daniel G.  . (May 1970) 147 w/an IH spring assist, 48" deck, 42" blade, 1969 73, #2 trailer, 10" Brinly plow and (on loan) Dad's #2 tiller.
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#4
09-22-2012, 10:56 PM
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I think you're on the right track, check your float level...sounds like the tab is bent too far up, not letting the needle come down far enough to fill the bowl.
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Wendy Oaks IH Cub Cadets, Springville, IA.
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#5
09-26-2012, 05:47 AM
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I had a similar problem with my 125 when I first brought it home, it turned out that a small piece of the gasket for the sediment bowl broke loose, and floated up and wedged itself into the 90-degree bend right after the fuel shut-off. it would only let a few drops of fuel through at a time, so the carb bowl could never refill fast enough. check to see if anything is blocking the lines, from tank all the way to needle valve.
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Ian Mine: 72 w/ k301, 3 125's, 1 w/ hydro lift, 38,42, & 2 48 decks, 2 42 front blades, QA-36a & QA-42a thrower, tiller, lo-boy 154. Also, LOTS of parts. family's:2 105's, 2 106's, 149, 2 lo-boy 154s, Farmall Cub. Non-IH: 1940 JD Model A, 1954 JD 40 U, 1955 JD 40 Crawler, 2 1956 JD 420 U's, both w/ Henry Loader and Backhoe. JD 110. Wheel Horse (model unknown.) Power King 1614. We love our tractors! 
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#6
09-27-2012, 06:10 PM
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I'm with the points-and-condensor crew. My buddy's 125 is having the same issues, and we're going to change them out and see if that helps. Hoping to find burnt or pitted points or improper gap or maybe even oil-soaked point box. These Kohlers will run like doo-doo once the points go bad or get out of adjustment.
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Tom 105, 149 w/44A, #2 & #4 carts 782 CCC Red w/44C 1512 Smoker w/50C, 450 Blower 2072 w/60" Haban IH/Lawnboy 3322 Pusher, Scag TT 61" JD 455, X495, Kubota 2150, Gravely 450, 812
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#7
10-07-2012, 03:20 PM
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Could be oil soaked points... will look.
I had it running yesterday. If I keep the throttle at half - 2/3 there seems to be enough "headroom" that it continues to run even if the governor kicks in to give it more throttle. If I don't, it'll soon develop a flat sounding exhaust note, followed by a stall and one final backfire. Strange... John PS: It DOES need an overhaul...
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61 and 63 Originals 123 (2) 782D 106, 147, 122 102 parts It's only original ONCE!
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#8
10-07-2012, 07:36 PM
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John,
You should be able to make it run well even though it needs to be overhauled. I had that #1 169 with the 14hp running really well, even though it had bad rings and sat outside with no head for 10+ years.  Keep us posted. I'm sure you'll get it.
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Wendy Oaks IH Cub Cadets, Springville, IA.
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#9
10-20-2012, 09:27 AM
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Sediment bowl
Does the carb actually pull fuel from the sediment bowl, or is it just a place for the gunk to fall before entering the carb? For example, if fuel is not feeding well from the tank, would the sediment bowl be drained ?
John
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61 and 63 Originals 123 (2) 782D 106, 147, 122 102 parts It's only original ONCE!
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