answersLogoWhite

0

Oil and Oil Filters
Home & Garden
Lawn Mowers and Garden Tools

Why does a Briggs and Stratton 4.5 HP lawn mower engine surge?


Top Answer
User Avatar
Wiki User
Answered 2015-03-01 03:59:27

Surging is the result of a "lean" fuel mixture, meaning too much air and not enough fuel. The problem is most likely a dirty carburetor or an air leak in the intake system. To fix, inspect the carburetor and intake manifold for cracks or looseness. Tighten all fasteners to ensure all seams are airtight. Clean out the carburetor with some carb spray and blow out all holes/orifices with compressed air. If problem persists, carburetor must be removed and disassembled/rebuilt.

001
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
๐Ÿ˜‚
0
User Avatar

Your Answer

Loading...

Still Have Questions?

Related Questions

Why does a Briggs and stratton 4.75 hp Murray pro series mower rpm surge?

it could be caused by a few different things. the pneumatic governor or a fuel issue. an easy test is to hold the throttle on the carb closed to an idle. if it continues to surge then it is a carb issue, if it stops it is a governor issue


Will a bad fuel pump cause engine surge on a lawn mower?

You probably have a dirty carburetor causing that surge.


What causes surging on 5hp Briggs and Stratton lawn mower?

The most common cause of surging is a dirty air filter. EPA approved carbs tend to run lean causing the surge condition described. Main jet needs to be replaced with next size larger.


What causes a mower engine Briggs Stratton 25hp to surge with gas and flood out after starting normally?

The engine is receiving more gas than it can consume. Sometimes the carburetor needle valve will vibrate to the open position or the float valve will stick open. Also, a fouled spark plug will not provide sufficient spark to ignite the fuel. Check out a lawn mowers and small engines repair manual from your public library for troubleshooting and repair procedures.


Why doas your 23 hp Briggs and stratton 2 cylander vanguard motor surge and sputter at high rpm?

You need to either adjust your carburetor richer or leaner while at full throttle.


How do you fix the engine surge in your v6 1984 Ford Ranger 4x4?

Check your vacuum lines this usually the cause for a surge in engine speed when idling or running.


What causes engine surge in 2004 Kia Sedona?

Engine surge in a 2004 Kia Sedona is often caused by a clogged fuel filter or dirty injectors. When insufficient fuel reaches the engine, it will exhibit these symptoms.


Can spark plugs cause a little surge in the engine?

my sparkplugs are gaped to wide can that cause my car to surge and poor starting


What does a bad IAC cause?

the engine to stall and surge at idle


How do you solve 1987 Mazda rx7 idle surge?

the surge the engine does when you first start it up is normal, the engine is built to do that to assist with warming up the system it should lower after 30secs or so.


Why dus your engine surge when you hit the brakes on your 95 4x4?

possible power booster diaphragm leak therefore engine receives atmospheric pressure into the vaccum which is more than engine wants you get more air and less fuel causing a surge


Why does my Toyota truck with 22re engine surge while idling?

Is the AC turned on?


Why does antifreeze surge in the overflow tank of a 99 Chevy Suburban?

Engine overheating will cause the anti-freeze to surge into the overflow tank. A blown head gasket will also cause the anti-freeze to surge into the overflow tank.


Why does a Briggs and Stratton 4.5 hp motor surge repeatedly?

One of the causes is reduced airflow to the carburetter, so cleaning or replacing the air filter may help. That may help but that will not cure the problem. If the lawn mower is surging then it is getting enough gas then it is being shorted. If the airfilter was the issue, the engine would more likely just run at a slower speed(2500-2800rpm's). Since the engine is surging, the carb must be cleaned and the gasket between the carb and gas tank has to be replaced. This is a very common issue for the Briggs 3.5 to 4.75 vertical shaft engines. It is very simple to clean the carb that is on that engine. Simply remove the airfilter and the two bolts holding the carb/gas tank onto the engine. After it you have the carb/gas tank in your hands, take the 6 bolts out that connect the carb to the gas tank. Clean everything out and replace the gasket and you are good to go. The most important thing to remember when you are removing the carb from the gastank is to take note of what goes first onto the gas tank(the gasket or the diaphragm, some come with the gasket first and some are the diaphragm first...luck of the draw. Hope that helps!


Why does the engine surge on a 1999 expedition?

check the throttle positioning sencer. (TPS) for short.


What would cause the rpms and the car to surge in 2001 Oldsmobile alero?

The RPMs and the engine of the 2001 Oldsmobile Alero might surge if there is a problem with the oxygen or fuel sensor. It may also surge if there is a problem with the fuel injectors or the fuel filter.


What causes an engine to surge?

we have a gas engine jenbacher 1006kw.we face a black shutdown due to exhaust back pressure high.


What is difference between surge absorber and surge arrester?

Surge arrester diverts the surge to earth but the surge absorber absorbs the surge energy


Why would a Ford Focus have engine surge?

a surge could be caused by anything from low fuel pressure to bad sensors. Check the computer codes to see if there is an issue that shows.


Is surge a verb or an adjective?

Surge is a noun (a surge) and a verb (to surge). It is not an adjective.


How many surge commands in kingdom Birth by Sleep?

There are five: Payback Surge, Thunder Surge, Fire Surge, Barrier Surge, Vitality Surge.


What causes a small gas engine to surge?

A load on motor cutting high grass to short.


What part of speech is surge?

Surge is a noun (a surge of anger) and a verb (to surge forward).


Why would a 1990 Blazer's engine surge up and down?

Any number of things could cause your vehicle to surge. You need to take your vehicle to a tune-up shop and have it diagnosed.


Why does a 12 hp Briggs and Stratton engine surge runs rough?

I suspect it is a dirty carburetor. My BS 12 hp had the same problem, I just took it off the mower, took out all the things that look like they would come out easily, cleaned inside and outside with gas, blew out all the openings with compressed air, and put it back on and it ran just fine. The other thing to look at is the spark plug gap. I think it is supposed to be .030, or something close. It is not hard because there isn't many parts to contend with. Just make sure none of the gaskets have holes in them, that would create vacumm leaks. If none of those help, consider a new carburetor or clean it with some type of stronger cleaner. Last resort, purchase a replacement, they run about $50.