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2005 21 HP Briggs & Stratton Intek V-twin engine misfiring

I purchased a used MTD Yard Machine with a 21HP B&S Intek V-Twin engine that was manufactured in 2005. It was running fine when I tested it out prior to buying and when I got it home it ran fine until I put some gas left over from the last mowing season into the tank. Apparrently the gas was no longer any good so the mower died and I could not get it started. Once I figured out the problem, I drained the bad fuel and put in new fuel and changed out the plugs for good measure. I tried starting it and it took several tries before it turned over (I assume because of a little of the bad fuel still left in the carburetor). Once it started it sounded OK for a few seconds and then started misfiring every other second. It still can run and mow and has lots of power, but I would like to know what I need to look at in order to fix the misfiring problem. Thanks for any advice you can give.

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 95 Answers

SOURCE: mower dies after running for a few minutes

It sounds like the carburetor is running out of fuel.First make sure the tank is full then loosen or remove the gas cap when it starts sputtering to see if that corrects the problem. Then with engine off remove the fuel line that goes from the tank to the fuel pump,hold it low and see if any fuel flows out of it,if not lightly blow air backwards to the tank,(with fuel cap off),then see if the line is plugged. Next remove the fuel line that goes to carburetor from the fuel pump,crank the engine and see if any fuel flows,if so the carburetor should be cleaned by removing it and disassembling it.

Posted on Aug 09, 2009

mowerman1857
  • 389 Answers

SOURCE: Briggs and Stratton 22hp v twin OHV smoking badly

First thing to do is pull your dipstick and check for broken or missing O-ring also as you pull it, look to make certain that it was seated properly and all the way locked. If either condition exists, you will be leaking into the crankcase which will cause your symptoms

Posted on Sep 14, 2009

SOURCE: 21hp intek v-twin runs only with choke on full

You are not getting enough fuel.... by choking it you are enriching the mixture with less air , more fuel.Some where in the fuel system or carbureator something is still plugged.Or the mixture screw is too far in.

Posted on Nov 07, 2009

  • 391 Answers

SOURCE: Have a Yard Machine riding mower with 21hp Briggs

It depends on the model but most riders have the following;
1. Seat switch
2. Brake pedal switch
3. PTO switch
4. Neutral switch (if its a shift model)

All need to be closed in order to start engine.

Posted on Jun 04, 2010

kel1guy2002
  • 3740 Answers

SOURCE: My 20 hp Intek v

Hi and welcome to FixYa. I am Kelly. What your describing is a fuel starvation / lean fuel mixture symptom.

First off remove the fuel supply hose to the carb and check fuel flow. It should be a normal gravity flow rate. If you don't have flow check the bottom of the gas tank for debris. I note you already changed the fuel filter and pump.

--Check to make sure that the fuel solenoid on the bottom of the float bowl is working correctly. You can unplug it and then test it with battery power to see if the plunger is moving.
--Also check it in place for 12VDC with the key on and seat switch activated (if installed).

Your parts list can be found here:
http://www.briggsandstratton.com/document/index.aspx?doc=MS3562_C_LO.pdf

The solenoid is item 947A of the above link. (pdf file page 5 top right)

With the fuel hose connected float bowl removed you should also chec the fuel float needle item 105 for proper operation. Float down... fuel flow.... GENTLY lift the float to LEVEL there should be no fuel flow.
These are the 2 most common problems:
Either the fuel bowl solenoid is not being energized / not working or.... (item 947)
There is debris in the needle and seat. (Item 105)

If you do not have 12VDC to the fuel solenoid you will have to find out why. (Safety switches.. broken wire etc.)

Before you reinstall the fuel solenoid clean the area with carb cleaner.

Thanks for choosing FixYa.

Kelly

Posted on Sep 28, 2010

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