| | Briggs 12.5 I/C Carb Mixture Screw | |
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Guest Guest
| Subject: Briggs 12.5 I/C Carb Mixture Screw August 11th 2010, 2:49 am | |
| G'day guys,
My engine is overfuelling a bit/running rich, was just wondering which is the mixture screw on my carb so i can lean it out a bit
Thanks |
| | | dangeroustoys56 Veteran Member
Age : 53 Join date : 2010-02-10 Points : 7028 Posts : 1726 Location : Florida, USA
| Subject: Re: Briggs 12.5 I/C Carb Mixture Screw August 11th 2010, 6:31 am | |
| Depends how old it is- after the 90's most motors come with a 'bolt' instead of a mixture screw ( EPA stuff) - the screw on top is for the air- the screw on the bottom of the float bowl is the fuel - usually a good rule of thumb is turn it all the way in till it lightly bottoms, then turn it out about 1 1/2 to 2 turns, start the tractor and adjust it till it stumbles, then back it off a turn.
Before doing that it might be better to clean and possibly get a rebuild kit for it first. | |
| | | Chunk Established Member
Age : 33 Join date : 2010-02-10 Points : 6172 Posts : 779 Location : Angus, Scotland
| Subject: Re: Briggs 12.5 I/C Carb Mixture Screw August 11th 2010, 6:45 am | |
| I'd take it apart, clean it well, then stiack it back together. If it's rich it'll be the jet on the bowl (if its adjustable) Just turn that in a little at a time and see it it bogs under acceleration. | |
| | | Guest Guest
| Subject: Re: Briggs 12.5 I/C Carb Mixture Screw August 12th 2010, 2:49 am | |
| Thanks guys i'll have a look into it. I'll get a photot of my carb and post up and if someone could name a few things on it for me would be great.
My rig is getting a full tear down and re-paint, bit of a freshen-up etc so the donk will get some TLC
One other question, is there an idle screw?...to drop the idle rpms
Thanks tyson
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| | | dangeroustoys56 Veteran Member
Age : 53 Join date : 2010-02-10 Points : 7028 Posts : 1726 Location : Florida, USA
| Subject: Re: Briggs 12.5 I/C Carb Mixture Screw August 12th 2010, 7:34 am | |
| Yepper - when you look at it from the top- the first plate inside is the choke- then behind that further in is the throttle plate - when its activated, part of it outside contacts a 'stop' - theres a screw that will lower idle speed. If that wont fix it, it could be an issue with the governer or governer link.... | |
| | | Chunk Established Member
Age : 33 Join date : 2010-02-10 Points : 6172 Posts : 779 Location : Angus, Scotland
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