14 hp briggs wont run

jjsc44October 27, 2009

I have a 14 hp briggs motor model# 287707 on a 33inch snapper mower. It died while mowing. I thought it ran out of gas but it didn't. It now will barely run at an idle. I cleaned the carb and the little electric valve on the bottom of the carb is working. It has good spark and compression any ideas?

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walt2002

Yes, remove the valve cover and see if both push rods are intact and that the valves are working properly.

Walt Conner

    Bookmark   October 27, 2009 at 6:09PM
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tomplum

Did you find any water /debris when you cleaned the carb? Fuel fresh? If so, did you at least run the line and replace the filter? Good flow of fuel the carb? Check the vent is open on the fuel cap and fuel shut valve as well if equipped.

    Bookmark   October 27, 2009 at 6:49PM
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jjsc44

changed the fuel filter and changed fuel still the same will check the valves tommorrow does anyone know what the clearances should be. thanks the leaves are really piling up

    Bookmark   October 27, 2009 at 10:59PM
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tomplum

The clearances are .004" intake .006" exhaust +/- .001" Set 1/4" after TDC. I think what Walt was referring to would be visible such like a damaged push rod or rocker. Let us know what you see. If that seems Ok, be more specific on how it is running.

    Bookmark   October 28, 2009 at 12:04AM
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roman_2009

I have a similar problem. 12 hp john deere that quit running in the middle of cutting grass. put new spark plug and it has fire. Sprayed starter fluid in carb, but still didn't fire. sprayed wd 40 on the valves and pushed them in and out with finger. NO success.

Help is appreciated...

    Bookmark   October 30, 2009 at 5:03PM
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tomplum

"I have a similar problem. "
Ideally, you should start a new thread in the tractors forum. Engine model / type #s are needed too. Also tell us the gap you found or if one valve seemed to have excessive clearance or not.

    Bookmark   October 31, 2009 at 1:07AM
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jjsc44

Thanks for all the help. I took the valve cover off and one of the rocker arms was off. I had been having a bit off trouble starting it, I assumemed the starter was going bad but evidently I was incorrect. Does anyone know the exact procedure for adjusting the valves as I don't have a service manual for this engine. thanks.

    Bookmark   November 1, 2009 at 9:43AM
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tomplum

Had it just come loose? The studs sometimes come loose from the head. You will need to know the push rods are are still straight and the stem caps are there. You can just use the specs and be kind to the set screw by not tightening the outer nut after setting the screw or the adjuster can become damaged. Walt in his generosity has sent instructions in the past if you email him.

    Bookmark   November 1, 2009 at 4:48PM
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jjsc44

I found the intake pushrod had broke. I got a new one and just need the instruction on how to set the valves. I don't know how to email Walt as I don't have his email address. I want to thank everyone for their help.

    Bookmark   November 3, 2009 at 5:44PM
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jjsc44

I may have another problem with the valves because I seem to have excessive clearance even with the nut on the rocker arm turned all the way in. The studs that screw into the head that the rocker arm bolts to hasn't loosend up. The push rod is a new briggs and stratton one. Anyone got any ideas.

    Bookmark   November 3, 2009 at 6:30PM
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walt2002

Well you must have found my address. As Tomplum said, is the cap that sits on top of the valve stem there? Even if it weren't, I thought there was enough adjustment to take up the space.

Are you sure the rocker arm isn't cracked thru the pivot?

If that pushrod broke from having a very worn spot in it, you are probably OK but if that was not the reason, look for sticking valve, loose valve guide or what caused the push rod to break.

Walt Conner

    Bookmark   November 3, 2009 at 9:41PM
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jjsc44

Thanks everyone for your help expecially you Walt your a life saver. It is now running. I guess I need new bifocals because I couln't see the little allen screws in the rocker arm, once I found it, it went back together fine. Its running better than it ever has. Thanks again.

    Bookmark   November 8, 2009 at 11:20PM
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grandpas

I have a 14.5 OHV 287707- put on new aluminum flywhell and starter gear changed oil and ridder ran fine. Next time not running mas well gas mixing with oil. So i put on a new carburetor. Now its hard to start backfires when it does run if you rev up throttle it won't increase the rpms.
After running for a little while muffler gets hot and starts smoking. I need help guys Were is this WALT CONNER
guy when you need him?

    Bookmark   April 16, 2011 at 11:23AM
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