Question about Briggs & Stratton Lawn-Boy Insight Series 21-Inch 190cc 650 Series Gas Powered Engine Variable Speed Self-Propelled Lawn Mower

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Engine surges and will not run smoothly (walk behind mower)

Engine would only start when the primer was used, took carb off and put new diphram gasket in. it now start easily but will not run smoothly , it surges im not sure i have the governor springs in the right location. my model is 9d902 type 1607e1 code 98032652 mtd model 11a020b352 seial #1d068k82280 picture of location would be great email @ edholzer@verizon .net

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 84 Answers

SOURCE: 6.5 ohv won't run unless you continuosly pump

try adjusting fuel intake on the side of carb. just unscrew it a hair and you should be fine.

Posted on Jun 25, 2009

rycgl
  • 1545 Answers

SOURCE: Murray Walk behind mower, Model # 20705X6M 5.5

Clean ALL the very small holes in the brass bolt that holds the carb bowl on.Some are VERY small and easily clogged. With bowl off and the bowl float hanging free, does gas readily flow? It should, and it should of course stop when the float is raised (putting the needle valve on its seat). If this event is occuring, then the main jet must be badly clogged. If no gas even gets into the bow. (not enough details).. then there is a vacuum lock or something strange going on in the fuel tank (cap). The threads of the fuel cap on a mower allow it to vent, preventing vacuum lock of the fuel flow.Start at the tank and go back in. Please repost as this is a good one.

Posted on Aug 18, 2010

rycgl
  • 1545 Answers

SOURCE: Bolens MTD push mower with B&S 4.5HP

This is probably not a blown gasket issue. A bad head gasket can allow oil to enter the cylinder head/combustion chamber if it's not sealing off the valve area. A simple suggestion is to check on the engine opposite the carb side for the oil/crankcase breather. It will have 2 screws holding it onto the block. It has a type of filter media in it that traps excessive oil and oil vapors from the engine. It is also connected by a tube to the air filter housing. When you tipped, you probably put too much oil in the breather and it was inducted over to the air filter/carb intake side.
Clean or replace the breather after checking it and also make sure you haven't overfilled the Briggs with oil and only use SAE 30 in the engine. Muti-viscosity isn't recommended in summer unless you run synthetic, then it is OK.
Please vote on this solution.

Posted on Sep 05, 2010

Testimonial: "Thank you - sounds like excellent advice and I'll sure let you know what I find."

al_kupchella
  • 843 Answers

SOURCE: I changed the air filter, pre-filter, fuel filter,

Sounds like the float valve is sticking open. You will have to drain the gas (or at least turn off the valve where the gas leaves the tank if so equipped.) Then remove the bowl to clean the float valve. (There is usually a nut in middle of the bowl.) The bowl looks like a bowl, and is about 2 inches in diameter. When you remove it you will see the float, which probably looks like a little brass donut. If you remove the hinge pin that allows the float to move up and down (it only moves about 1/2 inch) you will then allow the valve pin to fall out. The valve pin is about 3/4 inches long and maybe 3/16 diameter. (I am not measuring these things, just giving approximate dimensions so you will recognize them when you see them.) Good luck, Al K

Posted on May 19, 2011

SOURCE: adjusting governor/throttle briggs and stratton

there should be a little screw to help adjust your idle try that..counterclockwise to add more idle, clockwise to slow idle..

Posted on Apr 26, 2012

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1 Answer

Briggs and stratton engine in rover lawn mower ....... the mower is about 7 years old and maybe used once a year.....the fuel primer button does not seem to be working... please help !


what size motor squirt some starting fliud in the carb and it starts up probably need to rebuild carb no i no you will have to rebuild carb and get this feul additive called sea foam follow the instructions on the can it will make a old machine run like new run to tank fulls through it

Sep 12, 2014 | Garden

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Have a self-starting, self propelled toro lawn mower about 5 years old, I ran it out of gas by accident & now it won't start


It seems to be an obstruction in your fuel delivery system. Get a can of ether and a spray a short burst of it into the breather area near the carburetor, if the mower starts up and then stalls out, then you may need to get your carburetor serviced.

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Describe your Briggs Stratton Lawnmower Lawn Mower Short Block Problem. I have model# 11A-414E765 Lawn Mower. Starts ok but is surging and when I checked a brand new spark plug it was full of black dust...


I am pretty sure this is a 4.5 Hp engine with the carb on top of the tank. Plastic carb 4 or 5 mounting screws mating carb to tank. Remove the air cleaner... and tighten the carb to fuel tank mating screws. It is drawing air between the tank and the carb. This should stop the surging. If is has been a long period that you used the mower with the surging problem the diaphragm between the tank and the carb may be either out of position or damaged. The diaphragm is not expensive. Usually the first time this symptom presents itself you can resolve it by tightening the carb to tank scresw. IF you have the primer bulb carb..mash the rubber of the bulb against the carb body. If the surging stops... the primber bulb has a pin hole in it.

You passed the mower model number and not the engine model number. When we use the 11A number you passed all we get is the base and handle parts. If you need more help I need the model number off the engine just above the spark plug wire on the air shroud.

Thanks for choosing Fixya,
Kelly

Aug 31, 2011 | Briggs & Stratton Briggs Stratton...

1 Answer

Can you run your lawn boy mowers without the primer button being used?


Yes you can. The only reason small engines have the primer button/bulb is to get gas to the carburator to make it easier to start it. If your mower starts OK without using the primer bulb you will not harm the mower.

Apr 14, 2011 | Tecumseh Lawn Boy Push Mowers Insight...

1 Answer

Lawn mower starts and stops right away


take bowl off bottom of carb....clean and reassemble

Nov 16, 2009 | Garden

1 Answer

8hp Tecumseh engine how to adjust carb. when I put throttle on high it sputters drop the throttle back down its okay?


These symptoms indicate a rich mixture. Assuming the carb is the original (and therefore correct) one, and that it has an adjustable main jet, turn in the main jet adjustment screw on the bottom of the float bowl until the engine runs smooth.

If there is no adjustment on the float bowl, the carb will have to be removed and properly cleaned (ultrasonic cleaner recommended).

Oct 01, 2009 | Tecumseh Lawn Boy Push Mowers Insight...

1 Answer

Silver series 6.5 hp surging


  1. Carburetor is dirty.
  2. Air leak in carburetor or intake manifold (e.g., bad O-ring, gasket, primer).
  3. Carburetor is improperly adjusted
These are some of the more typical reasons that can cause a small engine to surge.

Jul 09, 2009 | Tecumseh Lawn Boy Push Mowers Insight...

1 Answer

Mower surging silver serieslawn boy 6.5 h.p. tecumseh motor model lev 120 spec 362006a. I cleaned out carb bought a rebuild kit replaced o rings in center jet and another under float also little metal...


let it surge, it will usually get better as it warms up. These 6.5 Hp engines are fine except they have an cheap badly designed carburator. Nothing can be done about this problem. They all surge eventually.

Jun 07, 2009 | Tecumseh Lawn Boy Push Mowers Insight...

1 Answer

Engine is surging.


hi,

sound through experience you have a air leak possible from a gasket or oring if so equipped. take some wd 40 and spray around the carb gaskets and seams. if this stabalises the surging or smooths it out it is definatley seeping air around it. in any case you will most likely need to take the carb back apart and repair or replace the gasket. hopes this helped. happy mowing!

Mar 29, 2009 | Craftsman Garden

1 Answer

Toro walk behind model 20025 Gas running through the carburetor


Carb. float must be stuck open. First if you have no fuel in the tank it must all be in the crankcase.Drain the oil and refill and also check the carb as the float has to be sticking open. Hope this will help you. Donnyb60

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