Experienced gardeners share their insights in answering this question :
I fear this is stale fuel in both carb and tank, drain the tank, if the carb has a float bowl remove it and empty the contents, refill with fresh fuel and pull until it fires up.

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 :

The most common cause of your mower engine not starting after a long period of storage is stale fuel, but there are many other possible reasons there could be a fault. Our advice is to contact your local lawn mower servicing provider for a professional inspection.
If it is difficult to start the ride-on mower, the most common reasons include: Old fuel; make sure to use fresh fuel, especially after winter storage. Spark plugs might be dirty or damaged. How to examine and replace a spark plug on your ride-on mower.
Your Mower Won`t Start:

Other possible causes include: 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.

Step 1: Empty the gas tank

Turn the mower off and allow the engine to cool, then siphon excess gas into a clean can. (You can put this gas in your car, provided it hasn`t been mixed with oil.) Restart the mower and run it until it stops; repeat until the engine no longer starts and the fuel lines are empty.

If you keep your mower in the basement during the winter, you should remove the fuel regardless of how much is left because storing it inside could be a fire hazard. If there`s only a little fuel left after the last mow of the season, your best bet is to run the tank dry.
Begin by starting your lawn mower`s engine to let it warm up for about 60 seconds. After turning off the engine, disconnect the spark plug wire to ensure your lawn mower doesn`t accidentally start while you`re working.
Check/clean/tighten all connections on battery/solenoid/starter/Ignition switch and neg(-) cable to frame or motor. Check to ensure all safety features are working properly and not engaged. Check for an inline fuse, bypass solenoid to see if engine cranks if it does replace solenoid, if no crank replace starter.
Can I store my lawn mower outside in the winter? You can store your mower outside in winter, but it isn`t ideal. If you must store your lawn mower long-term in your yard, make sure it is elevated, so that it doesn`t sit directly on the ground. This will allow air to circulate in order to keep it more dry.
A riding mower is perfectly capable of starting no matter what the weather or temperature. But cold weather will often show you the weak components in your mower.
Higher temperatures create higher resistance to the flow of voltage; that`s why coils usually fail when the mowers are hot and start working again when the engine cools.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Model 435 Husqvarna chain saw not starting
dumped gas and refilled not starting new last fall but now cannot start. any help with this. thank you
misplaced manual and need to have advice please

Read Full Q/A … : Garden

Husqvarna 345e Hard to start and when it does start it continues to run (chain).
ANSWER : I have a model 435 Husky that had the same hard-to-start problem–warranty service replaced the carburetor and it seems to work ok now. The chain that continues to turn can be fixed by turning the idle-speed screw (not the H or L jet screws) CCW a small amount until it can be accelerated then dropped back to idle to quit driving the chain. Hope this helps!

Read Full Q/A … : Garden

Hard to Start – Husqvarna 435-BRC-RB Chainsaw
ANSWER : Do you have good compression, good spark and is fuel getting into the cylinder.? More information is required

Read Full Q/A … : Garden

Cannot get the saw started – Husqvarna 450 e-series 18" Chain Saw
ANSWER : Check for spark check fuel filter carb kit if sitting for while new plug

Read Full Q/A … : Garden

Have spark wont start – Husqvarna Chain Saw 18" 450 Model 966955438
ANSWER : If there is a good spark at the plug, it can be one of two things, either the piston has picked up in the cylinder ( remove the muffler and check the condition of the piston skirt through the exhaust port ) or there is no fuel getting the the plug ( replace the fuel filter in the tank )

Read Full Q/A … : Garden

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.

Read Full Q/A … : Garden

ANSWER : If it starts and dies on choke.. then try these two things. Take the bulb off of the carborater and clean it out and clean spray the 2 holes that put gas into the float bulb. Also change the spark plug. This will fix your problem!

Read Full Q/A … : Garden

Husqvarna 385 I have a husqvarna 385 saw. It starts good, idles good, but as soon as you rev the saw it starts to cut out and runs very rough. but returns to a perfect idle.
ANSWER : Sounds like dirty carberator or carb needs adjustment. How is the spark plug?

Read Full Q/A … : Garden