Missing or flooding out

[Steve Schnipke]

Good Morning everyone:
I have a problem and would like some input. Yesterday went to plow about 9" of snow off drive way. Started up my cub, ran fine for the first five minutes then it started to act like it was getting too much gas. If I choke it half way ran better but not as good as normal. It will stall under load. The cub has ran fine the other dozen times I plowed this year. It is keep indoors, I don't know what could have changed. It is like it is missing or flooding out. There is some sediment in the bowl. If I remove bowl will gas flow out bottom of gas tank? while cleaning bowl. Thanks in advance. Sorry for the long post
Steve

[SundaySailor]

You should have a cutoff on your sediment bowl. Turn it counter clockwise to shut off the flow of gas to the sediment bowl. (That is if you have a shut off valve). I'd take the bowl off, and clean out the gunk in the bottom. Check to see if there is any water in there also. If so, you probably have some in your gas tank too. Replace the sediment bowl, etc. On the bottom of your carb, there should be a square looking plug. Remove this plug and drain your gas into a jar or can. Replace the plug and try to run your tractor again (after turning the gas shutoff clockwise). Also, some Cubs have a screen under the gasket for the sediment bowl. Clean that up good too. Some NAPA stores have replacement sediment bowls that have screen and gasket ready to go. Just thought I'd mention this as an alternative.

Good Luck!

Rick

[Ike]

You should have a cutoff on your sediment bowl. Turn it counter clockwise to shut off the flow of gas to the sediment bowl. ........

Rick

I'm probably wrong, but it seems to me that this would turn the fuel on, not off.

Ike

[Virginia Mike]

Also remove and blow out the main jet that screws in the side of the carb. If my Cub starts missing or surging water or trash in this jet is usually the cause.

Best,
Mike

[SundaySailor]

Ike, I need a cup of coffee. Too early in the morning.



Rick

[johnbron]

Ike, I need a cup of coffee. Too early in the morning.



Rick

Man`o`man did you ever screw up Big Time Rick You better have 2-cups of Java. Turn the valve counterclockwise to to get your coffee to flow.

[SundaySailor]

That first one sure tasted good. Mind not in gear properly this morning. Must've been thinking about the direction of turn on the Cub's PTO.

Rick - But Hey, the rest was decent, right?

[beaconlight]

Most cut off's I know of except for oil burners clockwise shuts off and counter clockwis on. On oil burners it only some that are backwards.

You probably stirred up sediment and rust plowing. That it runs better with the choke out means you are starving for gas, not flooded. There should be a screen at the carb intake too unless a PO has removed it. I had the same trouble cutting gras last summer. I took the carb off after cleaning the bowl and bowl screen. Took the carb apart, cleaned the carb bowl, removed the float and idle adjusting screw. Then I blew every thing out with air. Next I stuck as piece of fine telephone wire down the Idle air tube, then blew that out again. Put everything back together with a new gasket, tightened the carb screws till just tight not as Huggy Bear not to deform the carb. Screw the idle adj screw in all the way, then bqcked out 1 1/2 turn, again no Huggy Bear. There was no inlet screen on my carb so i didn't have to put that back. Hooked every thing up and all was well. 50 year old tanks rust and it blocks things.

Bill

[John *.?-!.* cub owner]

Steve, as was mentioned above, turn off the fuel (clockwise from knob side) and flush out the carb. Then turn fuel back on and check for a sustained flow out the drain on the carb. there is a screen where the line goes into the carb as well as one in the sediment bowl. Also check the gas cap for the vents being open. There is also the possibility of water in the fuel or carb that is freezing and blocking fuel flow after you are outside long enough. If your fuel line is routed so there is a low place in it the water would probably be there.

Another common possibility is the coil is getting old and quitting when it gets warm. They will mimic a carb problem. Had it happen to me about 12 years ago, and I hunted for a week before I tried the coil in desperation.

[Steve Schnipke]

Thanks to everyone who has replied, This will help alot. I have printed out all the replies and will get to work. Is there a schemithc or drawing of a cub carb, showing the location of the Main Jet?

[Rudi]

Steve sure is. It is on the Cub Manual Server in the TC-37F.

But, to save you some time here it is. The Main Metering Jet is part # 28

[John *.?-!.* cub owner]

If you have the Zenith carb rather than the Ih one Rudi posted I believe it is a page or two before or after that one in the same manual.