Question about Craftsman 20 hp 42 in. Deck Lawn Tractor - CA Model

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I need to know how to adjust valves on a 20 hp briggs motor model no 407677\0229-e1

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 23 Answers

SOURCE: need a procedure for valve adjustment on a briggs

go to youtube type in valve adjustment on briggs,simple procedure.

Posted on Apr 23, 2010

  • 302 Answers

SOURCE: I need to know the valve setting for a Briggs

Around .08-.10 clearance at top dead center.

Posted on Jun 30, 2010

  • 110 Answers

SOURCE: I am getting no spark at plug. Briggs model 31c707

Hello, the next couple of things to check would be under the engine lid.

  1. Remove the screen over the air fan on the top of the fly wheel.
  2. Remove the 4 bolts securing the main lid and remove. Depending on the year of this engine it may have a secondary cover that Craftsman put on that will need to be removed first.
  3. When the lid is off you will see the magneto coil right above the spark plug; just follow the spark plug wire up to it.
  4. Use a wrench to see if the magnet on the fly wheel is strong. If the magnet is bad or really weak the flywheel will need to be replaced.
  5. Next check the magneto ground out wire. It will be a small black wire on the magneto. Unplug it then crank the engine. If the engine starts plug the wire back on the magneto and if it shuts down there is a short along the wire. It should only shut down or short out when the key is shut off. You will need to find the short if this is the problem.
  6. If the magnet is strong and the above test still fails to provide a spark then it is likely that the magneto is bad. You will need the rest of the model number; it will look something like: 31c707- # # # # - # # The part runs somewhere around $35.00 from Sears, but you might find it on-line cheaper.
  7. Replacing the magneto is pretty straight forward from there.
  8. Remove the old one and replace the old one adjusting it as far away from the flywheel as possible.
  9. Turn the flywheel until the magnet is directly across from the magneto.
  10. Put an ordinary business card between the magneto & the flywheel.
  11. Loosen the 2 screws that hold the magneto in place just enough for it to tighten up to hold the business card in place.
  12. Tighten the screws holding the magneto & rotate the flywheel to remove the business card.
  13. Test rotate the flywheel by hand a couple of full turns to ensure there is no contact with the magneto.
  14. Replace the small black wire, spark plug and spark plug wire, then test fire the engine.
  15. Shut the engine down and replace all the remaining parts in the reverse order as removed.
You should be good to go after this. If this was helpful please vote yes. Thank You!!

Posted on May 07, 2011

  • 14 Answers

SOURCE: 2010 model 20 hp Briggs motor. Fuel going through

Two things:
1 Is fuel coming out of the fuel line. Older mowers have old fuel lines and they tend to get weak and collapse went they warm up with engine heat. Replace the old fuel line.
2 deposits in the carb. take off the air cleaner, start it up and spray a good carb cleaner in the carb until the engine dies. Put some 'seafoam' in the gas and a little in the oil and put the air cleaner back on and start the mower and mow on FULL THROTTLE. this should claen out the carb. Yes the mower will run rough for awhile.

these two cheap fixes will solve 85 % of carb problems. GOOD LUCK

Posted on Jul 17, 2011

richroth
  • 9472 Answers

SOURCE: need to know what model

You will need to post the engine model number. It can be found on the side of the engine.

Posted on Sep 15, 2011

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What causes push rods to bend on left bank of a 20 HP V- Twin


Here's some generic answers, not relating to this engine specifically:
  • The timing could be off, so the piston is hitting the valve.
  • A loose pin in the piston could be allowing it to extend too far, shoving on the valve.
  • I guess the valves could need to be adjusted so there's a gap.

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Motor will not turn when sparkplug is installed


I had this problem and it was due to needing a valve adjustment. There is some good youtube videos on how to adjust them not real hard to do.

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How to adjust the valves on b/s 18hp model 422707


Though the valves are adjustable, in a grinding cutting kind of way- they require the valve be removed from the block to do so. So no actual adjuster. The good news is, this "L head" engine doesn't have the same issues as the OHV family and rarely ever need valve service at all. Are you having difficulty

Technical Support
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I have briggs and stratton 5.5 hp motor model 12h702.And oil comes out of the breather.Could it be the valve guides or the rings. It smokes out of the breather hose and exhust a little.


It sounds more like badly worn rings and/or a glazed bore. Provided bore is not badly worn, a bore hone and a new set of rings should solve the problem. While yuo have the engine apart, a valve grind and check/adjust of the valve clearances wouldn't hurt.

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I have a 24 hp briggs, model 445777, type


I believe this does have comression release. Make sure you're rotating the motor in the correct direction, as I think the compression release only works in one direction. Adjust the valve to .004 with the piston at TDC make sure it's on the power stroke. Turn the motor till intake opens, then when you continue to rotate crank, unitl valve closes and piston gets back to TDC. Adjust both valves to .004. Then do the other cylinder the same way.

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Engine will not crank with every try.


Still sounds like a valve adjustment problem and as for relying on a Sears serviceman.....well. lol I just did a valve readjust on basically the same engine with identical symtoms and it starts fine now. As for the 10w-30, Briggs recommends 30w in the warmer climates.

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