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If you have lifted the mower on it's side or stored it vertically you can damage the diaphragm in the carb and it won't run properly without replacing the part. I had this done with a mower specialist and it cost me £60 so check it may be cheaper to replace the whole mower
Additionally: The mower may be a throttle free design. These models have springs that throttle the engine based on the wind produced by the flywheel on top of the motor. If these springs are worn, they can cause issues as well. This would be my first guess to what may be your issue.
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The diaphragm is probably worn out. You may not be able to tell by looking; sometimes they fail just from hardening up even if there are no holes. Failure of this part causes the engine to surge up and down and run poorly. Additionally, sometimes the motor will starve out if the fuel tank is less than half full.
It's very easy to change out, just one large bolt to free the fuel tank from the motor, four small bolts along the front of the motor, and five phillips-head screws to separate the carb from the tank. Then peel off the old diaphragm and gasket and replace with the new one--the diaphragm goes on the bottom and the gasket on top. The part number is 495770, and these days it's available for less than ten bucks delivered!
Take photos of the carb before you remove everything, and be very careful with the two springs. They're very lightweight and easy to bend out of shape, making them unusable. Before you reassemble everything, use some PB Blaster (or something) to lubricate the rotating linkages the springs connect to.
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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.
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
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.
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What causes a small gas engine to surge?
A load on motor cutting high grass to short.
What would cause a 240V motor to surge?
Your air compressor drive belt is loose, Tighten it up! geterdone
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.
Engine surge on 97 harley ultra classic?
i have sputhe engine with braided oil lines every time i start it it squits oil every where then it stops
Is surge a verb or an adjective?
Surge is a noun (a surge) and a verb (to surge). It is not an adjective.
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There are five: Payback Surge, Thunder Surge, Fire Surge, Barrier Surge, Vitality Surge.
Intermitten engine surge on 2003 ford e350 van?
check iac motor, or tps sensor for starters. check for tuneup.
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Possible clogged or partially clogged fuel filter, or a timing issue.
