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Briggs motor only runs on choke #5318035 01/09/20 06:32 PM
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Cowboy35 Offline OP
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Lawnmower will only run on choke, took the brand new carb and cleaned it, not a thing wrong with it. Getting plenty if fuel to the carb. Adjusted valves, check compression, checked for spark, all good. Anything else I can check that I'm missing. Thanx

Re: Briggs motor only runs on choke [Re: Cowboy35] #5318041 01/09/20 06:36 PM
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Eddie Offline
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Bad carb to engine gasket?


2014 CX5 Touring 2.5L :-)
Re: Briggs motor only runs on choke [Re: Cowboy35] #5318043 01/09/20 06:37 PM
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tundraotto Offline
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Too small a jet in the carb or dirt in it.....just buy a new cheap replacement carb.

Re: Briggs motor only runs on choke [Re: Eddie] #5318047 01/09/20 06:39 PM
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Cowboy35 Offline OP
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Gaskets are in good shape.

Re: Briggs motor only runs on choke [Re: tundraotto] #5318048 01/09/20 06:39 PM
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tig1 Offline
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Originally Posted by tundraotto
Too small a jet in the carb or dirt in it.....just buy a new cheap replacement carb.

Why not clean the jet instead?


2007 Ford Fusion 252,000 miles
M1 5-20HM
2017 Ford Fusion 85K
M1 0-20EP
10,000 mile OCIs on both engines
M1 ATF and M1 LV HP ATF
M1 10-30 in all OPE
MC filters

Re: Briggs motor only runs on choke [Re: tundraotto] #5318052 01/09/20 06:39 PM
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Cowboy35 Offline OP
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It is a brand new carb, I couldnt find anything wrong it

Re: Briggs motor only runs on choke [Re: tig1] #5318057 01/09/20 06:43 PM
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Went through the carb completely with carb cleaner, all jets clean.

Re: Briggs motor only runs on choke [Re: Cowboy35] #5318062 01/09/20 06:49 PM
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P10crew Online Content
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Not sure what vintage it is but on the side of the carb there is a small plate held on by 3 or 4 screws there is a diaphragm and a spring under that plate. Your diaphragm is shot. Replace it.
The diaphragm is your fuel pump.

Last edited by P10crew; 01/09/20 06:50 PM.
Re: Briggs motor only runs on choke [Re: Cowboy35] #5318067 01/09/20 06:54 PM
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JLawrence08648 Offline
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Bad carb

Re: Briggs motor only runs on choke [Re: tig1] #5318070 01/09/20 06:56 PM
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tundraotto Offline
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Originally Posted by tig1
Originally Posted by tundraotto
Too small a jet in the carb or dirt in it.....just buy a new cheap replacement carb.

Why not clean the jet instead?


because fully cleaning the carb - esp diaphgram is a pain, and often not successful - and a new carb is about the same price as a carb kit.

Depends on how sentimental you are about the carb that doesn't work I guess.

Re: Briggs motor only runs on choke [Re: P10crew] #5318074 01/09/20 06:57 PM
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Cowboy35 Offline OP
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Ok I will have to check that, dont remember seeing anything like that but I could be wrong.

Re: Briggs motor only runs on choke [Re: Cowboy35] #5318080 01/09/20 07:04 PM
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[Linked Image]

Re: Briggs motor only runs on choke [Re: Cowboy35] #5318087 01/09/20 07:08 PM
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Cowboy35 Offline OP
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I was wrong the motor is actually considered a MTD motor. Carb has nothing like that on the side of it, tell u the truth I dont even know where the diaphragm is on this carb.

Re: Briggs motor only runs on choke [Re: Cowboy35] #5318091 01/09/20 07:11 PM
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P10crew Online Content
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Well ok then.
The symptom that you have described is exactly that of a shot diaphragm .

Re: Briggs motor only runs on choke [Re: Cowboy35] #5318093 01/09/20 07:12 PM
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eljefino Offline
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Get a drill kit like this one and find the bit that fits. Then run the next bigger one through your main jet. If you notice an improvement but it's still not great, do it again!

I had to do this to a brand new carb I put on a briggs generator I got at the dump. Sometimes carbs are, well, universal, and don't do well with our lean running E10 gas.

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