17.5 hp 42 in. Deck Lawn Tractor – CA Model

Its full of oil but when tou try to go it moves then stalls but catches and gos again sporadically like it slips and then catches again is there a keyway on the pulley that could be sheard an slipping?
Experienced gardeners share their insights in answering this question :
Try changing the fuel filter, also check your ground connections.

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

Lawn mower surging is a result of either bad gas or spark plug, dirty air filter, or clogged gas cap vent. A dirty carburetor jet and fuel filter might also be the reason. You can also consider a carburetor gasket leak, which can be fixed by an engine starter spray.
If your lawnmower`s engine is surging it could be a problem with the carburetor. The carburetor mixes air and fuel to the perfect ratio for combustion. There are passages and nozzles (called jets) that route the fuel through the carburetor. The jets meter the precise amount of fuel that is needed for combustion.
Failure of any mechanical component, a broken hose, or clogged filter will cause tractor hydrostatic transmission problems. But the most common issue will be the oil itself. In the transmission section of your operator`s manual, you`ll find a section that covers oil viscosity.
If an engine is not getting enough fuel (this is called “running lean”), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge.
Engine hunting and surging at idle is usually caused by a fuel delivery, air leak, or governor system problem. Cleaning/overhauling the carburettor, adjustment of the governor, and/or changing the air filer may be required.
Surging and Lagging

Another good indication that your spark plugs are dirty or worn is if your vehicle experiences surges of speed, resulting in a jerking acceleration. These surges occur because your spark plugs are not igniting the fuel in your engine at the proper rate, resulting in an uneven speed.

Among the potential underlying causes are vacuum leaks, EGR system malfunctions, malfunctioning oxygen sensors, dirty fuel injectors, fuel pump malfunction, faulty spark plugs, a faulty mass airflow sensor, or a faulty throttle position sensor.
In manual transmissions, slippage is frequently caused by a worn-out clutch. Replace the clutch, and often the problem goes away. For automatic transmissions, damaged or worn clutch plates, transmission bands, or solenoid packs are often the culprit and one or more of these need to be replaced.
Slipping gears are usually due to normal wear and tear, which causes them to not engage properly and to slip in and out of sync. It is rare, but there might be a malfunctioning set of gears in the transmission, which is usually due to bad original manufacturing.
Loose, Dirty or Disconnected Spark Plug in Your Lawn Mower: Check it out, clean off debris, re-connect and tighten. Dirty Air Filter: Clean or replace. Fuel Not Reaching the Engine: Tap the side of the carburetor to help the flow of gas. If this doesn`t work, you might need a new fuel filter.
You can either clean the air filters, or you can replace them with new ones. If you have a foam filter, you can clean it with a drop of dish soap and warm water. Remember to air-dry them before using them again. But if you have paper air filters, you must replace them during the maintenance of your mower.
If the riding mower makes a heavy clicking or a rapid clattering sound when the key is turned to the start position, there is a problem with the battery or a part of the starting circuit. The clicking noise comes from a part called the starter solenoid.
Poor Engine Performance

Under heavy loads, a clogged fuel filter may cause the engine to randomly hesitate, surge or sputter. This tends to be more prominent when accelerating, especially up a steep incline.

Malfunctioning fuel injectors: Inadequate fuel supply through fuel injectors could lead to surging. Vacuum leaks: Vacuum leaks can cause a fluid mixture, which can result in surging.
Surging and Lagging

Another good indication that your spark plugs are dirty or worn is if your vehicle experiences surges of speed, resulting in a jerking acceleration. These surges occur because your spark plugs are not igniting the fuel in your engine at the proper rate, resulting in an uneven speed.

The problem may involve an annoying change (up/down) of engine speed while cruising at a steady pace, a low drop (or even cut-out) at idle or when approaching a stop, a wild high engine speed of several thousand rpm followed by a drop to near zero, etc.
Engine Surging

In most cases, a faulty fuel pump will not draw enough fuel out of the tank. In some cases, it will draw too much fuel out of the tank and your engine will surge sporadically as you drive your automobile. You will continue to have this problem until you replace the fuel pump.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

The engine surges at idle and then does not run constantly underpressure. sounds like fuel but cleaned all lines and used new fuel. any suggestions
ANSWER : A new spark plug and don,t forget to push in the choke after start.

I just bought a new toro mower. the engine surges in speed about 1/sec. how can i get it to run smoothly?
ANSWER : If this is a brand new mower you could take it to the shop where you purchased it. I will say that newer units are set to run pretty lean to meet emission standards and may surge a bit when not under a load. You could take a look at the carb and see if there are any adjustment screws visible. A minor turn with a screwdriver may solve your problem, probably turn the screw out about 1/4 turn or so, just until the surging stops. Many of the new machines today do not have any owner adjustable parts. If you don’t feel comfortable trying this, please supply a model number off the mower and more info might be available.

When I start it the engine surges. When I pull the handle on the wand the engine will not go to max rpm.
ANSWER : Check to see if the choke is not on.

Engine surges at idle or any speed – Troy-Bilt Pony Garden Tiller
ANSWER : That is called hunting and can be caused by various things. The governor controls the engine speed. Is the lever and link/spring correct. Carb in good shape? Spark plug clean and gapped? Fresh fuel or was there old fuel in it?

Craftsman 550 lawnmower engine surging
ANSWER : Sounds like you need to clean the carb

Poulan Weed Eater runs in surges, with or without air filter on will not run smooth. Mower engine (B&S 4 HP) is “FIXED SPEED” 20″ type. Engine started easy, it will run in pulsating surges.

New husqvarne 42 inch 22v b&s eng .engine surges bad at idle ok in full throttle dealer says this is ok not buying that
ANSWER : Yes, this is ok…. i would suggest to have throttle cable adjusted. it may be set back to low.

My engine surges,i tryed to adjust the gonvoner and now it just races and wont idle down
ANSWER : Adjust the govenor back to where is was. You have a partially plugged carb