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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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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Blown Head Gasket repair - How do I set the valves correctly? DO I need to turn the crank shaft or just tighten to remove LASH?

what type of engine are you working on. On GM small blocks you will need to turn the crank to zero on the timing tab, which will bring #1 piston to the top ( you can remove #1 plug and verify #1 piston is at the top) Then you will need to turn the rocker arm nut on the intake valves until the push rod is just finger tight, (turn the push rod as you are tightening the nut) and then turn it 3/4 of a turn. once you have done the intake valves you need to rotate the crank 180 degrees to bring up the exhaust valves and do the same procedure to them. If it is the valve lash it should start. Hope this helps, this will probably work on most cars.

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Can anyone help? i need torque settings for head gasket and settings for inlet tappets and exusht

Find complete torque specs here:
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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2001 mustang 3.8L v6 just had head gasket and intake replaced. Running ok except for ticking when engine is cold. (Didn't do that before). This morning, I was coasting to a stop w/o clutch Engaged or...

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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Flames come out muffler

Sounds like Intake valve gap is bad and there is gas in the oil ? Valves cleaned, lapped and head gasket redo . Not too spendy. About 25 dollars total for everything. The lapping tool & Compound, head gasket, OHV rocker cover gasket if equipped. Maybe an 'inch pound' torque wrench if you don't have one, misc socket set, rags, carb cleaner, starting fluid for the tougher build up and some new steel wool pads. Also the valve clearance specs on rocker arms and a few how to vids on youtube about adjusting your valves with feeler gauge and proper torque specs are listed in your engine's model number Manual online somewhere.

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Engine miss at low rpm, starting out is not throwing a code

check intake gasket by spraying carb cleaner around intake and head mating surface if idle changes then a bad gasket is in play. A lean code on bank one or two possibly both should show when computer detects. Does it seem to run good off idle? Also check plugs for proper gap or burnt electrodes.

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1 Answer

Up and down rpms . think the air vane is out of adjustment.have taken apart carburetor ,new float,needle valve and gaskets. cleaned gas screen.air filter. spring on air vane maynot be in correct postion on...

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

If there is no adjustment, then either the main jet is still partially blocked, or the carb has internal corrosion (in which case, you will need a new carb - it's not fixable).

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Just replaced head gasket, now has to much compression and won`t wind over fast enough to start. have had starter checked and seems ok .10.5 hp briggs and stratton motor in a murray 32 inch ride on lawn...

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.


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My sons TR90E has developed a lean miss. I have cleaned the carb and replaced the Air and Idle screws with new sets from Yamaha. I have not been able to adjust out the miss. It developed the miss after...

Reset the air and idle screws. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Clean the air filter. Install new carb manifold gaskets and be sure the bolts are tight. Let the float bowl fill then start the engine. Set the idle speed with the idle screw.

Be sure the plug wire fitting is clean and is a firm fit to the plug.
With engine cold, go with .002 valve lash on the intake and .003 on the exhaust.

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1 Answer

Car shuts off

most likely an intake gasket.. with engine running spray brake or carb cleaner along intake and the head if rpms increase replace the intake gasket

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