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Discussion Starter #1
Hello I have a question I have a 12 HP briggs on my JD 100 well it runs ok but surges at high speed load let say bogs down on a steep hill like normal then off the hill revs real high.Ive tried all kinds of different adjustments clean carb a few diff times.Then today I noticed this in the bowl is this normal?Look at the top of the hole looks like it rusting through but not all the way through.Could this be my problem?

PIC

Oh forgot to add it does leak gas from the bottom must be from valve stem bolt if I dont shut my gas off.
 

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Discussion Starter #2
Well after looking closer under better light there is a pin hole in the bowl.Put some epoxy on it will have to let dry and try again 2 morrow.Hopefully this is the problem.
 

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"I noticed this in the bowl is this normal?Look at the top of the hole looks like it rusting "

Doubt the rust on the outside has anything to do with your problem but certainly rust on the inside will and you need a new bowl, not an epoxied one, they are inexpensive.

Walt Conner
 

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Discussion Starter #4
"I noticed this in the bowl is this normal?Look at the top of the hole looks like it rusting "

Doubt the rust on the outside has anything to do with your problem but certainly rust on the inside will and you need a new bowl, not an epoxied one, they are inexpensive.

Walt Conner
Yeah it was worse but I know where i can get a good bowl for nothing but Im in no shape to drive right now so this will do until I get to work ;) I hope
 

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Just sand the rust very well, wash it out with gas, then patch up the hole (s) with solder, one of the briggs (12hp) had the same problem, except much worse, i let it sit for 4 years without any cover over the engine at all, the carb bowl was rusted paper thin, i just coated the bottom in solder and let it harden, works fine now.
 

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Discussion Starter #6
Just sand the rust very well, wash it out with gas, then patch up the hole (s) with solder, one of the briggs (12hp) had the same problem, except much worse, i let it sit for 4 years without any cover over the engine at all, the carb bowl was rusted paper thin, i just coated the bottom in solder and let it harden, works fine now.
Yeah Ill do that before I mount back on in the morning.Just wondering if that what was causing the surge seems to be more that likely.I have access to other carbs bowls whatever just dont want to make the drive LOL I put the epoxy on its what I used on a gas tank before on an ole ford truck and its still going fine so surley this will also.Just hope it fixes the surge if not oh well I quess LOL
 

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surging normally means your running lean, is your airfilter clean? how well did you clean the carb? if you use an air compressor and just blow out every passage you find, that might do it.
 

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Discussion Starter #8
surging normally means your running lean, is your airfilter clean? how well did you clean the carb? if you use an air compressor and just blow out every passage you find, that might do it.
Air filter is new gas cap is new yes I use air plus carb cleaner inside of the carb itself is pretty clean I just didnt sand the bowl like i should of it was one of those nights LOL but i do have access to other carbs but really dont want to use them they are for other projects running :) if all fails Ill just get a new one,hoping not to but if so oh well part of playing LOL this one is the only one that I have ever had trouble with surging like that quess ya learn something new on every project LOL thanks for responding it really helps ;)
 

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The 12hp Briggs that was once on my Murray would surge and bog under load if it was not adjusted properly. My experience was that engine liked to run rather rich, it seemed the governor worked alot better that way.
 

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Well lets hope it stops once you try it again. If not, when its surging, try taking off the air cleaner and holding your hand over the intake a little, surging should stop if the problem is a lean carb. If worst comes to worse you can also just ream out the main jet a little with a pin.
 

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What he needs it a new carb bowl so little flecks of rust won't keep flaking off and going into carb passages.

Walt Conner
 

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Discussion Starter #13
Some of his surging could be from worn throttle shaft . Have you checked that ?
Havent been here in awhile thought Id post the fix.BornAddict you hit it right on the nose ended up messing around with the throttle shaft to the gov.It was sloppy bent it around some and runs great now.I also bored out the 4 pin holes in the carb shaft man it really runs great now.Thanks for all ya help.
 
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