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Discussion Starter · #1 ·
I'm working on a Cub Cadet LTX 1050 with a Kohler Courage SV725-3021. Not long ago the crankcase flooded with gas as the carburetor float mechanism must have gotten stuck open and the fuel emptied into the engine. Apparently, even with a fuel pump, there was a lot of fuel flow just by gravity alone. It is possible that the owner ran the tractor for a time in this condition, but I am not sure. After this, I changed the oil and filter, disassembled and cleaned the carburetor, replaced all fuel lines, fuel filter, and fuel pump. I also added an in-line fuel shut-off valve for good measure. I removed, cleaned, and re-installed the gas tank. The engine started and ran....a bit rough....but it evened out within a few minutes. Two weeks later the owner called to say the tractor would not start, though he could get it to fire on starting fluid. I went out and verified good fuel flow from the tank to the carburetor bowl, verified that the pump worked and that we had good fuel flow all the way to the carburetor. At first I suspected a failed anti-backfire solenoid, but I removed it and verified that it works, the plunger moving with the turn of the key, as it should. But no dice. The engine would not start or run except on ether. I took down the carburetor again and gave it another cleaning. Still no dice. It only runs on ether. I decided to sleep on it, do some research, and reach out to all of you for some direction. If you have any ideas, I thank you in advance!
 

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Time for a new carburetor if indeed it runs on ether.

btw, running with gas in the oil is a real no-no, damages rings and bearings .... ... that is why you check oil before starting ... if it is too much on the stick, thinned out, or smells of gas ... Do Not Run, and correct problem.

You run in that condition, you may see engine failure a year later, maybe not ????
 

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Discussion Starter · #3 ·
Right. I pulled the dipstick and saw it was horribly overfilled...which surprised me since I was the one who had done the previous oil change, and overfilling is not a mistake I would be likely to make. Then, when it came pouring out the drain thin like water, I knew it was gas in the crankcase.
 

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I'm working on a Cub Cadet LTX 1050 with a Kohler Courage SV725-3021. Not long ago the crankcase flooded with gas as the carburetor float mechanism must have gotten stuck open and the fuel emptied into the engine. Apparently, even with a fuel pump, there was a lot of fuel flow just by gravity alone. It is possible that the owner ran the tractor for a time in this condition, but I am not sure. After this, I changed the oil and filter, disassembled and cleaned the carburetor, replaced all fuel lines, fuel filter, and fuel pump. I also added an in-line fuel shut-off valve for good measure. I removed, cleaned, and re-installed the gas tank. The engine started and ran....a bit rough....but it evened out within a few minutes. Two weeks later the owner called to say the tractor would not start, though he could get it to fire on starting fluid. I went out and verified good fuel flow from the tank to the carburetor bowl, verified that the pump worked and that we had good fuel flow all the way to the carburetor. At first I suspected a failed anti-backfire solenoid, but I removed it and verified that it works, the plunger moving with the turn of the key, as it should. But no dice. The engine would not start or run except on ether. I took down the carburetor again and gave it another cleaning. Still no dice. It only runs on ether. I decided to sleep on it, do some research, and reach out to all of you for some direction. If you have any ideas, I thank you in advance!
I know this is obvious, nut did you clean the needle valve? Sounds to me like it is sticking. I clean them with WD40, and the hole that it goes into. I put the valve in my hand, squirt WD40 and just rub with my fingers. Maybe clean the hole with same on a Q tip.
 

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Discussion Starter · #6 ·
Update: I went ahead a purchased an aftermarket carburetor (ebay, $36.15, delivered to my door, as compared to a genuine kohler carb over $200.00!), and the engine fired up immediately and ran perfectly, better than I had ever heard it run, both at full throttle, idle, and everywhere in between! So, the issue was truly a fuel delivery problem at the carburetor, despite my attempts to clean it thoroughly. Perhaps I should have soaked it in cleaner, or maybe one of those ultrasonic cleaners (which I do not have). But a 36 dollar replacement feels pretty good, and I just hope it continues to run well for a few more seasons.
 

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I've had a few very grungy carbs that failed to work very good even after a good soaking in a bucket of Chem-Dip ,I was ready to toss them away,but I read how some motorcycle guys were using pure lemon juice or white vinegar and they'ed boil the carb while submerged in either one for about 15 minutes and they came out like new..

I tried that, using the wood stove in my garage--got the white vinegar boiling good and dunked the carb in,let it boil awhile...I was shocked how clean it was after I took it out,and I put the carb back together,and put it back on,the engine ran perfectly again..
I tried lemon juice once too,it worked equally well,I guess the acidity & citrous cleans the metal right down to the pores--both times I noted a pile of white residue in the bottom of the pan,I suspect it was boiled out of the passages that carb cleaner cant really penetrate into..

I would not suggest boiling a carb in either solution in your house though...

I was gagging bad when the vinegar was boiling,and the lemon juice wasn't exactly pleasant smelling either!..(it did clear my sinuses though,like snorting ammonia!)..A gallon of white vinegar costs about the same as a spray can of carb cleaner but I think it works even better..especially on carbs plugged up with ethanol deposits..
 

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That's great that it's going again!

I havent tried vinegar or lemon juice, those are interesting. I have had good success with my ultrasonic cleaner, and Simple Green HD. I've cleaned probably 10+ carbs in it, it's more than earned its keep for me.
 
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