Tag: lawn mower wont start in spring

Push and Self-Propelled Lawn Mower Repair

Push Lawn Mower Won’t Start

An engine that won’t start won’t get much grass cut today. Your push mower has a single cylinder engine that is pretty basic. There are not a lot of fancy electronic controls for the electrical or governor systems and it is just a plain gasoline engine.

Every gasoline engine needs these things to run. It requires fuel, compression, air and spark and to troubleshoot why your engine will not start will require a systematic approach to figuring out why it won’t start.

Fuel

Today, we always start out with the fuel you are using. Is it good and clean fuel? Does it have water in it? Is it older than 90 days? Good clean fuel makes all the difference in the world when it comes to starting your engine. As fuel ages, it becomes less volatile and harder to ignite as the vapors evaporate that ignite easily.

Compression

Without a compression gauge, it is hard to tell exactly how much compression your engine has. You can however get an idea of the compression that the engine has by how hard it is to pull the engine over with the pull rope. If there is a good bit of resistance, then you should have good compression.

Air

A dirty air filter will cause your engine to run rich or get too much gas. You need the right mix of fuel to air for the engine to start properly. Check that air filter and if there is any doubt, replace it.

Spark

Obtain a spark tester and attach it to the spark plug and spark plug boot. Pull the starter rope and observe the spark. You should see a bright blue or orange color depending on what spark tester you have. If you have good spark, remove the spark plug and check its condition. Also check to see if it is wet with fuel. If it is, replace the spark plug and try to start the engine again.

If you are still struggling to get your lawn mower started, visit our Locations page for a small engine shop near you.

 

 

Lawn Mower Repair Tips

My Lawn Mower Won’t Start in the Spring

This is an all too common problem for lawn mowers today. The ethanol blended gasoline that is in use today is the culprit.

Your lawn mower sits for 5-6 months out of the year with gasoline in it and then you try to start it in the spring and nothing. Today’s gasoline begins to go bad after 90 days. It will then begin to separate the different chemicals all the while the ethanol is attracting moisture into the gas tank through the humidity in the air.

As the different chemicals separate from one another, they begin to dry up inside the carburetor. When this happens, the idle and main jets become plugged up as well as the emulsion tube. Now gasoline cannot go through them and into the engine, so that is why it will not start.

The carburetor will need to be disassembled, cleaned and put back together. If the ethanol intrusion is really bad, the carburetor will need to be replaced. It could be a very expensive one or an affordable one depending on what brand of engine it is.

It would be best to take your lawn mower to a shop near you to get it repaired by someone skilled at carburetor cleaning and assembly. You can find one on our Locations page.