Question about Briggs & Stratton Lawn-Boy 10640 20-Inch 6.5 HP Gas Powered Lawn Mower

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What is the correct spark plug for 10640C lawn boy mower

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: can't get my lawn boy started

check for a faulty wire to the engine kill switch it may be contacting the ground

Posted on Jun 22, 2009

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rycgl
  • 1545 Answers

SOURCE: Where is the egine model number located on a Lawn

Go to www.lawnboy.com and input the model number of the MOWER and probably any of the serial #'s if you don't have yours. More options and info will pop up and you may get your engine model info from there. I hear that the Duraforce engines are all the same model?

Posted on Jul 11, 2010

SOURCE: lawn mower dieing pulled spark plug (oil on plug)

Oil on the plug might mean you have excessive cylinder wear and it is causing oil to get into the engine and foul the plug.

You can try to a new plug and see if it runs longer before fouling but realistically you are probably looking at getting a new mower very soon.

Posted on Aug 08, 2010

hunter19_46m
  • 7482 Answers

SOURCE: Describe your Lawn-Boy 10640 20-Inch

Hi haystackcalh...

Sounds like you have dirt/debris in your caburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
Check/Clean/Replace your Air Filter, a dirty air filter can make your engine run to rich with fuel.
Note: ALWAYS USE COMPRESSED AIR TO CLEAN YOUR JETS AND PASSAGES, VERY IMPORTANT.
Note:Before you disassemble the carburetor:
Mark each piece with a awl, or some kind of instrument that will make an alignment scratch before you disassemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Sometimes you can get by with priming the carburetor or by using starting fluid and letting it run a few times like that, and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Check you fuel line condition after a while they will degrade and need replacment.
Check/Clean/Replace your fuel filter if you have one.
When you remove your fuel lines from the carburetor be sure to make a drawing to how the lines are connected to the carburetor.
Make sure you are using fresh fuel...and oil mix if your using a two cycle mower or weedeater with the oil to the right mixture and not too much oil as it can cause hard starting.
If the mower is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
The diaphgram may look good and flexible, but it can be deceiving and not act as a fuel pump as it should because it has become too hard and will cause hard starting,start and run and shut off, etc.
When you clean your carburetor, I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use COMPRESSED AIR to blow out all the fuel and air passages.The higher air pressure is needed to blow some of the trash/debris from the fuel or air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit, or you could also ask the parts man that you get your kit from.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Once you have your carburetor cleaned/rebuilt that should solve your problem.
Please take time to rate me

Posted on Aug 21, 2011

  • 1 Answer

SOURCE: When using the lawn mower the spark plug falls off and the engine fails

Does the plug itself falls off the engine or is it the wire that attaches to the plug? If it is the wire, check the rubber cap to make sure there is nothing jammed in there to keep it from seating on the end of the spark plug. The cap should snap into place when you press it onto the plug. If it does not snap on you will need to determine why. Inside the rubber cap there is a metal piece that fits over the end of the plug. If it is too big close it, some with a pair of pliers, if it is too small open it some with a screwdriver.

Posted on Aug 16, 2012

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Lawn boy 2 cycle mower won't start


Replace the spark plug and retry.
If a new plug does not work push the spring button on the bottom of the carburetor to make sure fresh fuel is in the fuel bowl.
if this does not work remove the spark plug and squirt some light oil (like wd 40) right into the spark plug hole; roll the engine over slowly a couple times using the starter rope. put the plug back in and snap the plug wire in place. If the mower now starts after a couple pulls it means the rings are worn, replace the rings.

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Engine will not start, no spark


Try taking of the engine shroud and cleaning the magnets on the fly wheel. Also clean the two little prongs that are really close to the fly wheel. Use fine sand paper or emery cloth. Then check the spark plug wire for rust (clean if any). Try replacing the spark plug if it is old.

Let me know if this helps.

roundo4

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Can't get my lawn boy started


check for a faulty wire to the engine kill switch it may be contacting the ground

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Stalling


I have same mower and just fixed what seems like a similar problem description. I had gone down the fuel system route and the symptoms just didn't add up. Stopped abruptly w/o sputtering once I reached warm-up temp. Replaced the solid state ignition (34443C now part number 3444D). Problem corrected and just mowed my 1/3rd acre w/ no issues.

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