lawn mower

Why My Lawn Mower Won’t Start?

Most of the time when a lawn mower, snow blower or any small engine won’t begin the cause is an issue with the gas or the carburetor. Here’s how to discover and fix the issue.

Causes Why Lawn Mower Won’t Start and What to Do

Dead lawn mower?

When you’re looking at a lawn full of yard that frantically needed cutting two weeks earlier, the last thing you want is a mower engine that won’t fire up.

Before you have a heart attack pulling on the rip cord of your mower (or snow blower), inspect the fuel and carburetor. They’re the source of more than 80 percent of all no-starts. I’ll walk you through the actions.

You’ll need hand tools and a socket set, a can of carburetor cleaner and your air compressor. And you’ll most likely have to make a journey to the small-engine parts store. However after an hour of effort, you simply might have a functional engine, and you’ll conserve a bundle by repairing it yourself. Let’s dig in.

Check the plug

I’ll assume you’ve cleaned the air filter, so the next step is to eliminate the trigger plug to see if it’s wet. If it is, there’s no chance the engine will begin. So tidy the plug with carburetor cleaner and let it dry. Cleaning it with compressed air isn’t really enough; you need a solvent to remove oil residue. If the plug was wet, move on to Step 3. If it was dry, skip to Step 4. If the fuel is more than a month old, get rid of it appropriately and fill up the tank with fresh gas Then reinstall the spark plug and attempt beginning. It might take many pulls to draw the brand-new gas into the carburetor, so be prepared to clean and dry the plug a few more times.

Check the carburetor bowl for gas

The engine can’t get gas if the fuel filter is plugged or the carburetor inlet needle is stuck. Inspect the fuel filter (if equipped) by eliminating the fuel line at the carburetor. Gas must run out. If it doesn’t, remove the fuel line ahead of the fuel filter inlet. If gas circulations, the filter is clogged. Change it. If you still do not get any gas, the fuel line is kinked or plugged. And inspect inside the tank for any debris that might obstruct the outlet.

If you’re getting gas to the carburetor, check to see if there’s any fuel in the bowl. Secure off the fuel line with a C-clamp. Then eliminate the bowl. If the bowl is empty, the issue is a stuck inlet needle and seat. They’re easy and inexpensive to change. However prior to you purchase the parts, check┬áthe condition of the remainder of the carburetor’s interior. If you see any deterioration, it’s “game over.” A rusty carburetor is a dead carburetor. Replace it.

red lawn mower

Clean the jet

Get rid of the carburetor bowl nut. Place the carburetor cleaner straw straight into the main jet passage and squeeze the trigger on the can numerous times up until the spray shoots into the venturi of the carburetor. That’ll validate the passage is open.

A clogged main jet is a quite common issue. You can try cleaning it with spray carburetor cleaner. Then attempt starting. If the engine still isn’t really getting gas, replace the carburetor.

If it starts but runs rough

If you got the engine to start by cleaning up the primary jet, however it runs rough or the idle speed rises, you have two options– restore or replace the carburetor. Detach the old carburetor from the linkage, get rid of the two maintaining bolts and slap on a new carburetor.

Tools & Materials

Needed Tools for this Project

Have the essential tools for this DIY job lined up before you begin– you’ll conserve time and frustration.

  • 4-in-1 screwdriver
  • Adjustable wrench
  • Rags
  • Socket/ratchet set
  • Needle-nose pliers

You’ll likewise need rubber gloves.

Required Materials for this Project

Prevent last-minute shopping journeys by having all your materials prepared ahead of time. Here’s a list.

  • Carburetor cleaner
  • Fuel
  • Carburetor or carburetor inlet needle and seat


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