more cub problems!

this is a different cub from last week. ive been using it to plant all weekend. and on my back to the barn it started sputtering and i pushed the clutch in and it came back a little then it started sputtering and completly died and refused to start. came back a few hours later and after playing with the choke and throttle i got it to start up and act just fine. put it in the barn and now it wont start at all. it will sputter a little but not run. i read some past posts and switched the coil with another tractor. there was some sediment in the bowl. i have good flow to the carb. but when i opened the drain a bunch of gas came out. when i turned the fuel line on just a trickle came out the drain. what do you guys think? something clogged up in the carb / float problems? thanks in advance!

Is that just a trickle from the gas tank to the carburetor? If it is you have blockage in the tank or gas line. Shine a good flashlight into the tank and see if any rust and dirt is blocking the outlet from the tank. Hal

i have good flow to the carb out of where the fuel line screws into the carb. but the drain at the bottom of the carb is where the initial rush and then the trickle was

Sure sounds like there is either a problem with the float in the carb sticking or you have some stuff in the carb bowl. Is there a screen in the bowl filter? If there is then I would say the float is your culprit.

First, tap your float bowl on the carburetor a couple times with a screwdriver handle. If this fixed the problem, then you had a stuck float/needle. If that does nothing, then take your carburetor off the manifold by disconnecting the air cleaner, gas line, choke rod, and governor connecting rod. Take the 4 screws holding the top and bottom of the carb together off. Go to NAPA and get a rebuild kit for your carb (probably 30 bucks) and slap 2 new gaskets, a needle, and a seat in the carb. The rest of the parts probably aren't needed. While you have your carburetor off, soak it in carb cleaner over night. The next day, take your main jet (the little bolt-looking thing on the non-engine side of the carb) off. Blow it out with compressed air, and reinstall. Put your whole carb back together and put it on the tractor. This should be a fairly painless process, but there are a few trouble spots:

1. Stripped threads in the carb at the manifold - Be careful here, but some stripped thread repair should fix this.

2. Leaking at the gas line connection - If you have a metal line will this really be a problem. A likely culprit will be stripped threads in the carb. Be careful using thread repair here, because you can actually glue your line to the carburetor. You can also buy some gasoline-grade teflon tape to put on the threads to seal the connection.

3. Runs good until under load - Float tang is bent so that there is not enough gas coming through the valve (just bend the tang to fix this).

4. There is gas flow until the bottom half of the carb is reinstalled - Float tang is bent down, so that when the bottom of the carb is installed, the float pushes up on the needle and shuts the fuel off (again, bend the tang the appropriate way to fix this problem).

Good luck with your Cub, SF

I will add to the possible list that there could be junk in the seat (where the needle closes off the incoming fuel. If the strainer in the fuel inlet fitting is clean, it should flow.
There is a need to check that fitting screen at the carb, it is often an issue. Jim

You probably need to remove the tube fitting where your gas line connects and look for a screen that may be blocked. If that looks ok you probably need to clean the carb by soaking it in carburetor cleaner and blowing out the jets. Hal