127 stalling

[DL127]

I have a Cub Cadet 127 that I have owned for a couple years. I bought it from a fellow that had no information about any service or repairs it has had.
I installed new genuine Kohler points and carburetor kit. Set the points and adjusted the valves and governor. The engine starts effortlessly within 1 or 2 seconds at any outdoor temperature. It idles great and will run all day at 1/4 throttle or less. But if I move the throttle past 1/4 position the engine speed will increase, run for 30 seconds or so and die. The more wide open I move the throttle the faster the engine stalls out. It refires and runs great the instant the throttle is lowered and I hit the key. I bushed the carb throttle shaft, rechecked the float and rechecked the intake and exhaust valve setting. I have not pulled the cylinder head so I don't know the condition of the valves etc. Any advice would be greatly appreciated.

Thanks DL127

[dale c.]

sounds like a fuel problem , check the settlement bowl theres a screen in it . make sure it has good fuel flow out of the tank

[ol'George]

Try enriching the main jet screw 1/2 turn and see how it acts after you check the fuel flow as suggested.
Also,
many times a piece of foreign material ( IE.fuel line hose) will become lodged in the fuel inlet fitting at the carb that leads to the needle valve.
Does pulling the choke help?
Another thing comes to mind:
A bad condenser can and will allow an engine to start normally and idle
at slow speed all day long,
but when the throttle is advanced, it will not rev up and will act like a fouled plug/missing/sputtering.

[R Bedell]

I agree with the others. There is some sort of Fuel Problem.

[DL127]

I replaced the condenser at the same time I replaced the points. I fabricated a stainless steel gas tank from 4" pipe, removed the settling bowl and installed new tubing, an inline fuel filter and petcock. I'm stumped. It has done this stall out thing since day one. When I rebuilt the carb I dismantled it and ran it through an ultrasonic bath cleaner and blew compressed air thru every port or hole I could see. I'm convinced it's fuel related as well but other than out right replacing the carb I don't know what to do. The only ignition part I haven't replaced is the coil. I haven't tried pulling the choke before it stalls. I will try opening the high speed screw 1/2 a turn.

[R Bedell]

Again, it is a FUEL issue.

Try running the tractor with the Gas Cap off. See if it is a "venting" issue.

[darkminion_17]

Originally Posted by DL127

I replaced the condenser at the same time I replaced the points.The only ignition part I haven't replaced is the coil.

You make no mention of replacing the points to coil wire or spark plug, use a champion H10C or equivalent and gap to .025.

Remove the bowl nut, while holding the bowl on and see if you get a good flow out the hole.
The carb has a vent hole so fuel can flow in it you should check for blockage there.

I know the points have been replaced, did you clean the contacts?
Inspect them carefully and see if the plastic arm is broken, it happens.

[DL127]

Installed a different carburetor. Engine still stalls out. What diameter fuel line should my 127 have?

[finsruskw]

Ya got a vented cap on that fancy shmancy new fuel tank??

[DL127]

Yes sir she's got a hole drilled in the cap, and I can see day light thru it. When I got the tractor it had a 1/4" od copper tubing fuel line with compression fittings. I replaced it with new 1/4" od copper tubing. The inside diameter is a bit over 1/8". I guess I'll replace the copper with larger id hose and maybe that will correct the issue.