22″ Rear Bag Rear Propelled High Wheel Lawn Mower ()

Experienced gardeners share their insights in answering this question :
Could be a number of things, but on a machine that’s sat for a while with fuel in it, I’d try dealing with the stale fuel and associated water in the float bowl of the carb first.


Empty all the fuel out of the tank and dispose of it safely.

Replace with fresh fuel.

Get a small jar and slip it in underneath the carburettor (small mechanism, usually towards the front on the right hand side of a mower engine, with the hose from the fuel tank going into it) to catch the fuel you’re about to drain out.

The bottom of the carburettor is going to look like a small metal bowl, maybe an inch or two across, with a bolt going straight through the middle of it from underneath (sometimes there’s a second bolt too).

Find a spanner that’s the right size (the bolt is usually brass or aluminium, and if you try to use the wrong size of spanner, you WILL damage it) and loosen the bolt in the centre of the bowl by a turn or two until fluid starts to drip out (think a little bit about which way you turn the spanner – the mind plays odd tricks when faced with a bolt screwed up towards you).

Make sure what comes out is going into the jar then look critically at what it is.

What comes out at first is likely to be oily water. This comes out slowly in big drops that stay bunched up when they land in the bottom of the jar. If you put a bit on your finger and bring it to your nose, it smells unpleasantly oily. It may contain rust coloured blobs of microbial contamination.

Once the water is gone, you’ll get petrol (“Gas” to those who speak the other sort of English). This just runs out, spreads out over every surface it touches and makes the place absolutely reek of petrol the moment it comes out.

As soon as you’re getting petrol out, gently retighten the bolt to stop the flow, remove the jar (dispose of the contents safely) and then, once you’re sure all the spilt fuel is safely removed, have another go at starting the mower.

If the machine starts, all well and good. You may find that it runs for a few minutes before hunting uncetainly and then dying. If this happens, youve got another slug of water in the carb, which needs to be drained out as described above.

If it still doesn’t start, the next place to look is the ignition system – If you help with that, post back here explaining what you’ve already done.

Let us know how you get on.


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 :

A dirty carburetor is one of the most common causes for a lawn mower not being able to start after sitting unused for months or years at a time.
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.

If a mower is hard to start, it may be the result of a dirty carburetor and/or a clogged air filter. Use a screwdriver to remove the carburetor and clean any dirt out of it with a rag. Clean the air filter or replace it if it`s disposable.
A Dirty Carburetor Can Cause a Lawnmower To Start Then Die

By far, the most common issue that causes a stalled motor is a dirty carburetor. The carburetor on your engine is the thing that draws in air and mixes it with the fuel. Contrary to what the movies might make you think, gasoline itself is not very flammable.

If your lawn mower starts, runs briefly, then dies these are the four most common reasons that`s happening: Dirty carburetor / clogged carburetor bowl. Old gasoline that has gone bad. Dirty or defective spark plugs.
The spark plugs are worn or damaged

If you find that your lawnmower keeps dying, or keeps stalling while cutting grass, then inspect the spark plugs. Look for signs of damage or wear. Something as simple as a cracked porcelain insulator can mean an electrode has been damaged or burned away.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

I have trouble starting a toro walk behind mower
ANSWER : All, I thought my carb was shot, so I replaced it. Still, start but no run (and had to use starting fluid). THEN!!! I noticed the spring to the “rev limiter” (just below and towards rear of carb) was not “tight”. The stupid bracket that holds the end of that spring had been bent down ~1/16″ and that caused all this heartache. CHECK YOUR REV LIMITER!!!

Wont start no ignition put new plug in and fuel filter
ANSWER : Flush gas tank, fill with fresh gas and Stabil. Replace air filter. Remove bowl from carb clean bowl and holes in bowl screw.

Why wont my mower start and gas comes out of muffler
ANSWER : Carb is flooding out ether bad plug or your carberator needs rebuilt

<!– from fixya rte –>Rj19lm plug gap for a 195cc 4cyl lawnboy – Lawn-Boy lawnboy" Mower Blade 21"
ANSWER : As a starting point in my shop i always use 0.30 in. For all my mowers

ANSWER : Take the old plug out, any auto store should be able to match it up.


Mower starts and immediately shuts off and wont start again if i let it sit for five minutes it does the same thing checked oil and air filter carb is clean attempting to find correct socket to remove plug
ANSWER : Pull the fuel line from the carb & see if it is running steady, If so the next check is the carb bowl to see if maybe the float needle is partly plugged, and then it could be the valve lash clearance which will require more mechanical knowledge.

M0wer wont start good fire ther is fuel to carb
ANSWER : Clean out the jets in the carb

Lawn mower will start and run for 5 seconds and shut down
ANSWER : Will it stay running with your choke on? if so then clean your carb. if not then look for a blockage from tank to carb. ie fuel shut off, deteriorated fuel line. plugged filter etc