Riding Lawn Mower 42 Inch Cut Yth2042

I have replaced all gas lines but still surges when started. When I put into drive the lawnmower cuts off.

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The most common reason for a surging lawn mower engine is a blockage in the fuel supply, but there are other possibilities: Bad gas. Bad spark plug. Dirty/faulty carburetor.
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.
A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.
There are several reasons that surging occurs. A restriction to flow or fouling in the air/gas system is one possible factor. This could be caused by a dirty charge air cooler, or dirt or contamination on a nozzle ring, for example.
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.
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.

Engine surging is usually a warning sign that your car or truck is having combustion problems. Since a vehicle`s ignition wires and spark plugs play a major role in proper engine performance, it is likely time to check your engine`s electrical components.
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.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Mower jerks when going up an incline. – Husqvarna Riding Lawn Mower 46 Cut Kohler Yth21k46
ANSWER : Belt spilling

How do i tighting a belt on a husqvarna riding mower YTA19K42
ANSWER : Ask you grandson

How do i add transmission oil – Ariens Lawn Tractor 46"" Riding Lawn Mower 936053"
ANSWER : Should a plug or cap on top of transaxle.

Starting will not start
ANSWER : Pull the air cleaner and check for obstructions, dirt, oil etc. Leave off and try to start. Check plug for oil or wetness from fuel. Have a spare handy to check for spark. A shot of instant start into the air cleaner housing might help if the mower has bad or old fuel. You should drain the fuel out if it over a month old and unpreserved. Also, if the mower has been sitting with fuel in it the main jet sometimes gets clogged up due to todays alcohol enhanced fuels. You should get some help with removing the main jet and cleaning it out.

How to unlock motor on husquavarna mower – Husqvarna Lawn Tractor 48" Deck, 23 Hp, Model# Yth2348
ANSWER : I’d love to help but don’t know what you mean by ‘unlocking’ the motor?

How do I by-pass safety switches onyth24k48
ANSWER : Unplug them or install a jumper depending on the electrical circuit design.

How do I bypass the brake switch
ANSWER : Follow the shaft/arm that the brake pedal is attached to, the switch will be activated by that pedal arm.

Sputtered, died. Will not start anymore – Husqvarna Lawn Tractor – 54in. Deck, 26 HP, Model# LGT2654
ANSWER : Sounds like the carburetor needs cleaned and maybe rebuilt. If you can spray a little starting fluid (or a little carb. cleaner or anything volitile) into it and it starts and dies, you know it is in the carburetor.I hope this helps.