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Garden Tractors Discussion Forum

17 hp briggs, carb problem, keeps flooding out

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trying to get h

02-22-2007 12:06:48




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i have a 17 hp briggs opposed 2 cyl. model # 42A707, type # 2238 EL. no adjustments for carb except idle speed and i know you have to change jets to lean it out or richen it. it runs good wide open but tries to flood out when idleing or 1/2 throttle. it has a 112 main jet now and was wondering if anyone knows what size to try to lean it out? also maybe the idle jet needs to be smaller. i don't have any other jets yet and don't care to make a million trips to get the right one. the float is plastic and i can't bend the tab to adjust that but it looks ok, level with body and i think thats the right setting. pretty sure the float needle is ok and not leaking either. also is there a different carb i can put on this that has the adjustments?

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trying to get her running

02-24-2007 06:56:14




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 Re: 17 hp briggs, carb problem, keeps flooding out in reply to trying to get her running, 02-22-2007 12:06:48  
hey thanks guys, i replaced the float needle and she runs like new, the other one must have been bad from the beginning cause i bought this mower brand new and it always ran a little rough at idle and as it got older it kept getting worse. i looked at the original needle under a magnifiying glass and there is a dent in it, looks like where it got pushed too hard against the seat and that must have been where it was leaking. can't wait for spring and start mowing.

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JT

02-24-2007 08:40:08




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 Re: 17 hp briggs, carb problem, keeps flooding out in reply to trying to get her running, 02-24-2007 06:56:14  
That little "dent" is from gasahol making the needle tip soft and then creating the little ring you are seeing, and causing the leak, if you are using gasahol, make sure it is less than 10% alchahol, tesed by you, I have tested gas to find anywhere from 13-20%, even thought he pump says 10%. and that 13-20% causes problems. I run a shop and other than routine service, I would guess 80% of the service problems we have with lawn mowers are fuel related failures, and it is due to gasahol(75%), too long of storage(15%), or just flat poor quality fuel(5%) being sold today.

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trying to get her running

02-23-2007 09:37:15




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 Re: 17 hp briggs, carb problem, keeps flooding out in reply to trying to get her running, 02-22-2007 12:06:48  
ok, thanks i'll try the float needle & seat first and see what that does. i didn't think about it when i said it runs fine at high rpm but not at lower so changing the main won't help as that controls the high rpm's. if the float doesn't help then i need to look at the idle jet right?



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Wrench Spinner

02-23-2007 16:27:02




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 Re: 17 hp briggs, carb problem, keeps flooding out in reply to trying to get her running, 02-23-2007 09:37:15  

I would suggest ONLY replacing the float needle first without the seat and see if that solves your problem. The seat is brass and is pressed in the carb. top, Without proper tools and knowledge you could damage the top. If the needle does not solve your problem I would suggest taking the top only to a local mower repair shop and let them replace the seat, If they screw it up they are liable for a replacement.

The top of this carb. is no longer available separately, You must purchase a whole carb. which on your engine is part # 694026 and list at $163.70....
Also this carb. has the brass float fellas. Take the float in two fingers and shake it next to your ear. If there is fuel inside you will hear it then replace the float also.

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JT

02-23-2007 14:18:25




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 Re: 17 hp briggs, carb problem, keeps flooding out in reply to trying to get her running, 02-23-2007 09:37:15  
no, the jets will have no effect on the flooding of your engine.



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JT

02-23-2007 06:19:07




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 Re: 17 hp briggs, carb problem, keeps flooding out in reply to trying to get her running, 02-22-2007 12:06:48  
As other suggested, the only way to fix your problem is to replace the float and needle and seat. The needle has a rubber tip on it and it has a brass seat, the rubber tip can get hard and the seat can erode a little and cause the leaking you are referrring to. the newer palstic floats normally do not soak gas,and what youare describing is not a float problem. As Wrench Spinner told you, changing jets will do nothing but lean out your engine, then it will run hot and eventually burn up the engine, so leave the jet alone, find the real problem.

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Wrench Spinner

02-23-2007 03:41:22




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 Re: 17 hp briggs, carb problem, keeps flooding out in reply to trying to get her running, 02-22-2007 12:06:48  

I agree with Bills on the float needle valve, Changing the high speed jet will have nothing to do with the low speed circuit but will cause a lean running high speed RPM and also cause the engine to start hunting.



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Bills1450

02-22-2007 19:50:11




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 Re: 17 hp briggs, carb problem, keeps flooding out in reply to trying to get her running, 02-22-2007 12:06:48  
My guess would be your float needle isn't seating right. I'd change that before messing with jets. It's burning the gas at wide open but can't use it all at lower speeds.



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El Toro

02-22-2007 13:21:53




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 Re: 17 hp briggs, carb problem, keeps flooding out in reply to trying to get her running, 02-22-2007 12:06:48  
My first thought was the float. Having owned several Ford cars back in the 1980's and having a starting problem after the engines were heated up
to operating temp and then shutoff. I thought the carburetors may needed to be rebuilt until I called the local Ford garage. They said plastic floats had been used and the floats became gasoline soaked and were sinking causing the engine to flood. I replaced the floats and that fixed the problem and I had buy the top gasket too. Hal

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