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Jon K.
Jon K., Small Engine Diagnostic Expert
Category: Small Engine
Satisfied Customers: 5818
Experience:  Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
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briggs and stratton 19 hp twin model42A707 carburator does

Customer Question

briggs and stratton 19 hp twin model42A707 carburator does not hold idlle and runs rouch
Submitted: 5 years ago.
Category: Small Engine
Expert:  Jon K. replied 5 years ago.

Thank you for choosing Just Answer, my name is Jon and I will do my best to help you find the answer you need to resolve your problem.

You are going to need to remove your carburetor from the engine, clean and rebuild it.

Before anything make sure you diagram all your linkages or take some pictures so there is no question when you reassemble it. Once it is off the engine you are going to want to completely disassemble it then soak all the metallic parts in a good quality carburetor cleaner (most auto stores carry this) for 12-24 hours. Make sure that all the jets and emulsion tubes are clear. Running a small wire through each hole will make sure of this. Once everything is clean the carburetor can be rebuilt with a new carb kit.

Here is a good page that describes with pictures how to go ahead disassembling your carb and what to clean. Make sure you read through page two as well as that page is more important
Carburetor dissasembly page