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404-Carb problems

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herkpilot

12-23-2005 18:20:16




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My 404 has benn sitting a while. I rebuilt the carb (twice) and it was pretty gummed-up. It"ll fire off but the only way I can keep it running is to pull the breather tube off and choke it with my hand until it starts, then keep moving my hand to keep it going, usually more choke than open. It about sucks the glove off my hand and it"s gonna be tough to drive that way. Any thoughts?




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El Toro

12-23-2005 18:48:43




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 Re: 404-Carb problems in reply to herkpilot, 12-23-2005 18:20:16  
Have you checked the fuel flow to the carburetor?
If you have a plug on the bottom of the carburetor, you need to remove the plug and see if gas flows freely. If you have good flow to the carb. Your float and needle valve may be gummed up not allowing the gas to rise to the correct height in the carburetor. You may need to disassemble the carb again. I would drain all of that old gas and add several cans of that injector cleaner to the tank & add some fresh gas. Then start the engine and see if the cleaner fixes the problem. I would add some fuel stabilizer when the tractor isn't used. It will gum up you gas tank too. You can drain the carb if the tractor isn't used often. I had the same problem on a snow blower and I removed the carb bowl and sprayed it with brake parts cleaner. It ran ok after that. Hal

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herkpilot

12-24-2005 00:07:35




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 Re: 404-Carb problems in reply to El Toro, 12-23-2005 18:48:43  
I checked fuel-flow at every joint and it"s even running out the air-intake side. I put a brand new sediment bowl plus another inline filter and I have good fuel-flow. I blew it all out with Berryman B12 after vatting it for a couple days, and then disassembled it again today and dug a bunch of stuff out of various holes and ports. The drain plug on the bottom was pretty gummed up but after picking it apart I still didn"t get the bowl to drain from there, and I knew the bowl was full. I"ve added half a can of SeaFoam to about 3 gal of new fuel in a previously dry tank. I"m having to choke a carb that has fuel running over my hand as I choke it. Air leak somewhere, maybe?

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El Toro

12-24-2005 03:51:06




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 Re: 404-Carb problems in reply to herkpilot, 12-24-2005 00:07:35  
You could have an intake manifold leak, but you said in an earlier post you had a good vacuum when placing your hand over the Carb to choke the engine. Have you soaked the carb in a good cleaner? That would remove the gummy deposits
and then blow out the fuel passages with air. Your float is what acts as the fuel shutoff and the float valve. Any foreign substance such as dirt or gummy gas residue can cause this flooding. Make sure the float isn't leaking. Shake it to see if it has gas in it. They do get pin holes in them and this causes them to sink. When that happens the gas isn't being shutoff. Hal

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herkpilot

12-24-2005 09:00:24




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 Re: 404-Carb problems in reply to El Toro, 12-24-2005 03:51:06  
Eureka!I spoke with someone at Owasso Tractor and when I told him what it was doing he told me exactly what the problem is. In the carb there are two small holes in the lower body that should go all the way through to a diagonal hole where the jet screws in. I got one of them to go all the way through but I wasn"t sure if the other was supposed to so I didn"t press the issue. Both are supposed to and he reccommended using a tiny drill bit between your finers to clean it out. First a small to break through then a larger bit to really clean it out. I"ll let you know in a couple days. thanks for the help.

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El Toro

12-24-2005 09:13:08




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 Re: 404-Carb problems in reply to herkpilot, 12-24-2005 09:00:24  
Now you can enjoy Christmas. Hal



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herkpilot

12-24-2005 08:36:04




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 Re: 404-Carb problems in reply to El Toro, 12-24-2005 03:51:06  
When I rebuilt it I replaced the needle valve, cleaned and checked the floats, etc. What I found is when it sat the cast iron body rusted some and I haven"t found a vat product the can get rid of the rust in the tiny holes. That just requires something like welding tip cleaning brushes. Real fine and stiff and lots of patience. I thought the same thing about the manifold but great suction tells me otherwise. Is it possible the bowl seal is leaking and causing this? Gas is seeping out there even w/tight screws. I shouldn"t have to restrict the airflow if I have too much fuel. Should be the opposite unless there"s too much air coming in somewhere else. If the breather were intact it would restrict airflow so maybe I have to put that together first. I"m stumped.

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El Toro

12-24-2005 08:55:49




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 Re: 404-Carb problems in reply to herkpilot, 12-24-2005 08:36:04  
When you replaced the needle valve on float did you replace the seat too? Your float level may be set too high. This is what controls the level of gas in your carburetor bowl. As you run the engine the float will drop as the gas is being used and when the bowl is full the float shuts that fuel flow off. Make sure your float level
isn't set too high. Did you try air pressure to blow out the rust? If any rust gets under the needle valve seat, the gas won't stop flowing. Hal

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herkpilot

12-26-2005 16:44:50




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 Re: 404-Carb problems in reply to El Toro, 12-24-2005 08:55:49  
That was the problem. I used a couple 1/16 drill bits to clean out the holes and it fired right off. Trouble now is I can"t get it above barely running (I hesitate to call it an idle). The rusty sediment bowl I replaced had a a standpipe modified to it to keep the junk out of the bowl, but I haven"t seen too much in the bowl and the screen is clean but I have a clear inline filter that hardly fills up. I think I"ll verify the governor"s adjusted correctly, fill up the tank and play with the needle valve until it works. Good news is the transmission didn"t blow any seals when I backed it up 30 ft before it died.

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El Toro

12-26-2005 18:40:36




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 Re: 404-Carb problems in reply to herkpilot, 12-26-2005 16:44:50  
Does it have a main jet adjusting screw near the bottom of the carburetor. If it does I would open it several turns CCW. Hal



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herkpilot

12-27-2005 08:54:33




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 Re: 404-Carb problems in reply to El Toro, 12-26-2005 18:40:36  
It does, and I"ll try that first. Thanks



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herkpilot

12-24-2005 09:02:51




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 Re: 404-Carb problems in reply to El Toro, 12-24-2005 08:55:49  
Check out the other post I just did. I just thought I cleaned out the nooks andcrannys properly.
Merry Christmas!



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