Lawn Mower Carburettor Cleaning Tools

All carburettors will need love at some point. A lawn mower is simple, but the carburettor is a precision piece of kit. They won’t tolerate dirt or blocked passageways. Some carburettors are more pron to clogging than others.

Honda carb’s don’t like dirt, either do the Briggs & Stratton new type plastic carb’s. Symptoms of dirty carburettors varies, some of which include:

  • Surging engine
  • Engine won’t start
  • Starts but stops
  • Dies when cutting
  • Will only run on choke
  • Black smoke from muffler
  • Struggles to cut
  • Dies when blades engaged
  • Dies when cutting a hill

Carburettor Gumming

Most carburettors can be cleaned with good success, but sometimes cleaning won’t fix the problem completely.

Gumming is a common problem, the mower gets put away for the winter with untreated gas in the fuel system. (I’m guilty too) Over the winter months, the gas evaporates and leaves behind some nasty chemicals that damage your fuelling system.

Of course you only learn of the when you try to start it in the spring, it’s a dead duck. Sometimes you can clean them successfully, but often it’s just too badly gummed up.

Corrosion is another killer, moisture in the untreated gas can attack the metal components, rust in a carb will torment you, just go ahead and replace it, carburettors aren’t too expensive.

Most importantly of all get some gas stabiliser into your gas tank, you can use it all season it you like but you really only need to use it when storing. It works in all gas engines including 2 cycle, but it’s not a replacement for the oil mix.

Anyhow I use a product called Sta-Bil, it good stuff and does the job – when I can remember to use it.

On this page I have listed the tools and products you’ll likely need to help you clean and replace your carburettor, I’ll explain what the tools are and why you’ll need them.

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Tool set

Before we can do anything, we'll need tools. I've selected this set as I own some Craftsman tools and while I have broken them, they did do a lot of work. So I expect this set will last the occasional user quite a long time.

This set carries both metric and standard sockets and that's important, because some mowers will have both type of fastener sizes. Picture links to


Mix this with the gas when winterising your small engine. Gas isn't what it used to be, it goes stale, in some cases after just one month. Bad gas causes gumming and that's a carburettor killer. Stabiliser will save you money and stress in the long run. Picture links to

Carburettor cleaner

When cleaning your carburettor you'll need this stuff. Gumming is a sticky substance that's hard to shift. The carb cleaner will remove it, however if your carb is really bad, save yourself some work, go ahead and buy a new carburettor. Picture links to

Oil extractor

You'll find this tool really useful if you need to drain the gas tank, and you will if the gas is stale. The siphon will remove it without fuss or mess and it can be used for extracting the oil too. Picture links to

Fuel line clamp

Some small engines will have a gas tap, which is really handy when removing the carburettor, stops gas flowing all over the shop. However most engines won't have one, these useful clamps simply squeeze the fuel line and prevent a spill while you perform surgery. Picture links to

Carburettor cleaners

You'll find these nylon brushes super useful when it comes time to clean those tiny passageways of the carburettor and jet. Use these in conjunction with the WD Carb cleaner. Picture links to

Spark plug gapper

This tool isn't strictly necessary if you have a feeler gauge, but it's a lot easier to handle. If you haven't guessed, you use this tool to check the gap of your spark plug, simple effective tool. Picture links to

Auto Technician and Writer at | Website

John Cunningham is an Automotive Technician and writer on I've been a mechanic for over twenty years, I use my knowledge and experience to write "How to" articles that help fellow gear-heads with all aspects of mechanical repairs, from lawn mowers to classic cars.