Question about Briggs & Stratton 190cc 875 Series OHV Walk Behind Lawn Mower Engine 25mm x 3532Inch Length Crankshaft 12S5020025B1

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Have b&s 800 series,new carb,head gasket set valve lash, starts but no increase in rpms

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  • tom tyrrell Dec 06, 2012

    can also feel blow back thru carb while running

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Blow back is probably valve lash with all the work u have done. Check also ur governor and make sure the spring is hooked up

Posted on Dec 28, 2013

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Posted on Jan 02, 2017

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Hi, problems with my john deere 160 lawn tractor.


Ok there are so many things to go over. Have you checked the carburetor bowl? Be careful to unscrew it an clean out any old debri in it. The fuel today has ethenal in it an collects water. I go to a station that sell gas without it. Mowers an tractors hate ethenal. Then clean out the mail jet wit compressed air or carb cleaner. Also check the valve lash, these engines have a tendency to go out as time goes by. You could have a blown head gasket, check to see if you notice oil or blow by around the head or heads. Check your fuel lines for cracks, if they are old they will feed the carb to much air. I could go on an on, but do some checking with the carburetor that is most likely your problem.

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Find complete torque specs here:
http://fme-cat.com/LiveDocs/99999.pdf
and don't forget that you MUST buy new head bolts since they are torque to yield and MUST OT be reused!!

I suspect that you at least need to check the valve lash but as long as your head gasket is not dramatically different than original (which it should not be because that would change your compression ratio) you should be close to okay (I would check it). Or if you had any machine work done to the head, in which case you certainly would need to adjust the valve lash.

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they probably didn't set the valve lash correctly one of your cylinders isn't firing correctly get a cylinder compression tester and test each cylinder

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This is almost certainly due to lean mixture. If your carb is adjustable, back out the high-speed mixture screw 180 degrees.

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A head gasket will not greatly increase the compression in a a Briggs motor.

My question is Why did it need a head gasket to begin with?
Will bet it was not running...

A more likely cause if not a fuel problem is to check engine oil if that is good remove the wire from the low oil sensor and see it it will start up for you.

r/
David

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1 Answer

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