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3.5 briggs my 3.5 briggs runs rough when handle is push down to lift front of engine runs better for few seconds then goes rough again

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Sounds like the carb bowl is full of water - loosen the bottom bowl nut to drain till fuel runs clear - check fuel tank also water will lay on bottom

Posted on Oct 21, 2008

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It has a v twin briggs engine and it idles ok but revved up it runs rough like choke is on any idea what problem could be already rebuilt carburetor

possible blocked exhaust /muffler
check ignition module as it may be failed and cannot handle rpms

Jul 14, 2015 | Garden

1 Answer

Briggs stratton problems

Is there a screw setting on the carb? if so turn it to the left and this allows more fuel to make it run better. Turn a little at a time and you will hear the engine rev better.

Jul 19, 2014 | Briggs & Stratton Garden

1 Answer

How do I adjust a throttle on a briggs and stratton engine?

If it the simple handle type throttle cable..push it to full tbottle and follow the cable to the should fund a small clamp that hold the cable in position..jus loosen and adjust the carb throttle to full throttle and tighten..then push it back to idle to make sure it Idles if not adjust the clamp again until you reach both throttle and idle..good luck..

May 17, 2014 | Briggs & Stratton Briggs Stratton...

1 Answer

Briggs and stratton sp 460 engine will idle but not rev

I suspect the push rod for your throttle isn't pushing the throttle lever down on the carb. When you move the lever up on the handle bar then it should move the lever down on the carb. The push rod my be bent, broke or rusted in place.

Mar 16, 2014 | Briggs & Stratton Garden

1 Answer

After the mower runs for a while the throttle starts going up and down

Most of the time when this is happening there is trash in the fuel tank and when the gas gets low the pickup tube sucks it up blocking fuel flow. The tank needs to be cleaned out. When you empty the tank of its gas do not pour it back in the can, you're just dumping dirt in your clean gas.
Second cause is the diaphragm in the carb has developed a small tear in it and needs to replaced. Most of the Briggs and Stratton engines on push mowers these days use a small plastic carb with a prime bulb on the side mounted to the gas tank . Rebuild kits are inexpensive costing 3 or 4 dollars and usually include directions that are easy to follow with PICTURES. (Trust me, even I like pictures to help remember how that pesky linkage goes back on) If you are cleaning the tank it is just a few more steps to rebuild the carb so grab a few simple wrenches, a philips screw drive, a can of carb cleaner and go to it. And one last thing. On the carb where it slides on the intake there is an o ring with a plastic washer. Rubber o ring goes next to the carb side and backup washer goes on the engine side. Use a dab of motor oil on the rubber ring to make sure it slides on without binding.

May 20, 2010 | Mtd 22" Yard Machine Push Mower

1 Answer

Briggs&Stratton 4.5hp seeking/hunting

Did you replace the pump diaphragm and gasket between the carb and fuel tank? There is also a screen on the carb and a secondary pickup 'hole' on the fuel tank that needs to be cleaned between them too. You'll see that when you take the carb off the tank.

May 17, 2009 | Parks Optical 13.5hp Briggs And Stratton...

2 Answers

13.5 briggs runs rough spits & sputters

Hello rbryan492:

From your Description it Sounds like a Blown Head Gasket between the Push Tube Galley and the Cylinder, the Valve Clearance Requires Setting or the Flywheel Key is Damaged and Requires Replacing.
>>If you Require More Assistance, then
>>Send me the Model and Type or Spec Numbers Off the Unit, Please. With these I can Locate the Proper Manual and Better Assist you. The Model Numbers May be Stamped Into the Blower Housing (metal engine cover) Above the Spark Plug. Many horizontal shaft, overhead valve engines have these numbers stamped into the OHV rocker cover. However, on certain overhead valve powered generators, the equipment manufacturer installs a decorative chrome rocker cover OVER the Briggs cover. If your engine has a decorative cover, it may be necessary to remove it in order to locate the Model, Type, and Code. If this is a Briggs and Stratton Engine, then you can Also Use this Site Addy; for Assistance in Locating the Model, Type and Code Numbers of the Engine.
Please, Do Not Hesitate, If I Missed Something or you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck


jbridger (John)

May 14, 2009 | Parks Optical 13.5hp Briggs And Stratton...

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