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Ask Donald Your Own Question
Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1800
Experience:  I have 25+ years of experience repairing 2 & 4 cycle engines
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I have a briggs and stratton 4.0 Quatro mower and it is

Customer Question

I have a briggs and stratton 4.0 Quatro mower and it is rough running and using alot of fuel and blowing black smoke
Submitted: 9 months ago.
Category: Small Engine
Expert:  Donald replied 9 months ago.

Hello, and thank you for choosing Just Answer. My name is***** will be happy to assist you. This is an indication that your engine is running rich. Have you checked your air filter?

Customer: replied 9 months ago.
cleaned it throughly
Expert:  Donald replied 9 months ago.

Does your carburetor have a choke?

Customer: replied 9 months ago.
no
Expert:  Donald replied 9 months ago.

Can you get the model and type numbers from your engine for me? I would like to pull up a diagram.

Expert:  Donald replied 9 months ago.

I would like to pull up a diagram that includes your carburetor. Did this problem occur suddenly, or gradually, over a period of time?

Customer: replied 9 months ago.
Can't find numbers sorry and happened gradually
Expert:  Donald replied 9 months ago.

Are you familiar with cleaning carburetors?

Customer: replied 9 months ago.
Not really but it can't be to hard
Expert:  Donald replied 9 months ago.

The reason I asked, is because your carburetor is likely flooding due to a partially sticking float, a leaking float, debris between your needle and seat, or sediments in the bottom of your float bowl. You will need to remove the bowl from your carburetor, in order to check for these possible faults.

Expert:  Donald replied 9 months ago.

Have you replaced, or checked your spark plug recently?

Expert:  Donald replied 9 months ago.

Was your air filter very dirty, before you cleaned it?

Customer: replied 9 months ago.
Filter wasn't to dirty and have replaced the plug and I will try the carburetor clean and see how that goes
Expert:  Donald replied 9 months ago.

Very good! Please let me know what your results are. Thanks!