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830 Gas Frosting at the carb

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Jeff

12-29-2001 18:41:26




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My brother has an older 830 Comfort King 1968(gas). The problem he has is any time he uses the tractor after running it a bit it will quit running. Let it sit awhile and it starts up and runs for awhile till the carb throat frost up again and dies. Is there some kind of baffle between the carb intake and exhaust at the bolt up connection. We have added Heet to gas and it makes no differance. You can keep it running sometimes by pulling the choke almost all the way out, than it has no power and smokes. Thanks

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JEFF L

01-02-2002 19:17:38




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 Re: Re: 830 Gas Frosting at the carb in reply to Charlie, 12-31-2001 19:11:52  
Thanks Charlie, That is what I kinda thought what was going on. Is that passage up above where the intake and exhaust bolt up together? Is it a small hole where the intake air is drawing some exhaust air? I'm just trying to get prepared before I tear it apart. Thanks Jeff L



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erkki helin

12-30-2001 11:40:39




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 Re: 830 Gas Frosting at the carb in reply to Jeff, 12-29-2001 18:41:26  
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Chris Vangel

12-29-2001 19:34:46




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 Re: 830 Gas Frosting at the carb in reply to Jeff, 12-29-2001 18:41:26  
Howdy, My friend Larry from Wisconsin has 400 gas models that do the same thing. He says once it begins to frost on the outside, he shuts down the engine and waits a few seconds for the frost to melt. With this done, he then starts back up and it works fine the rest of the day. Adding chemicals to the gas will not help. The chemicals help to keep water from freezing if it happens to get in your tank. The temperature drop at the carb is a natural occurance because of the pressure drop as air/fuel moves through the venturi of the carb. Because you atmospheric pressure on one side of the venturi and engine vacuum on the other side, the pressure drop causes this temp drop at the throttle. Moisture begins to freeze at that point. I am not sure why letting it defrost those few seconds allows it to function correctly the rest of the day, perhaps it warms the intake manifold enough to prevent the freeze from occuring. When Larry reads this, I'm sure he can tell you better than I.

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Larry

12-30-2001 16:14:57




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 Re: Re: 830 Gas Frosting at the carb in reply to Chris Vangel, 12-29-2001 19:34:46  

Hi Chris,

I'm not exactly sure why my method works,but it does. The problem Jeff is having sounds a little different than what goes on during engine warm up.He is having trouble keeping the engine running all together. Hhhmm,sounds like we have a mystery.



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Allan

12-30-2001 12:50:18




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 Re: Re: 830 Gas Frosting at the carb in reply to Chris Vangel, 12-29-2001 19:34:46  
It shouldn't do this at ANY temperature, just from freezing up to 50 or maybe 60 when conditions are right. Basic problem has to do with lack of heat from the exhaust manifold transferring to the intake. The other thing that can aggravate this is if the crankcase breather is routed back into the intake, as some people used to do to get rid of the blowby.



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Chuck

12-30-2001 13:17:41




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 Re: Re: Re: 830 Gas Frosting at the carb in reply to Jeff, 12-30-2001 09:05:34  
try giveing it a little more gas to lean all.foil wrapped around intake just abouve carb. will help alot



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