It is not unusual to see a red-faced gardener, building up a sweat, pulling and pulling again at the starter cord with no result. The cause might be a burnt plug or a clogged filter, but is most likely that not taking proper care of their lawnmower fuel during downtime, and probably aren’t using the best petrol for lawn mowers.
What Is The Best Petrol For Lawn Mowers?
The fuel for your petrol lawnmower must be unleaded, the octane must be a minimum of 87, and if it contains ethanol this should be no more than 10%. Very important, the petrol must be fresh. Most people don’t know that fuel can become stale.
Two-stroke engines will use a mix of high-octane petrol and special two-stroke oil in the ratio of 50 parts petrol to 1 part oil. To be safe, check the manufacturer’s instructions. This mix should be done in a container, not in the tank of the mower.
If you can’t be bothered with mixing or separately sourcing a quality petrol and oil, Aspen has you covered. The product below is pre-mixed at 1:50 ratio is 92 octane and has NO ethanol. It’s honestly a very high quality lawn mower fuel for two-stroke engines that you really can’t go wrong with.
- Aspen 2 is an extremely clean, high quality petrol made from alkylate petrol
- It contains zero ethanol
- This product is pre-mixed with quality oil at a ratio of 50:1, saving you time
Four-stroke motors don’t need the oil and fuel to be mixed as they have separate fuel and oil intakes. However, they still require fresh, high-octane, low ethanol petrol. Again, Aspen offer a high quality petrol for lawnmowers that is perfect in any 4-stroke lawnmower engine.
- Aspen 4 is the cleanest petrol that you can use
- Aspen is made from alkylate Petrol
- virtually free from sulphur, benzene and aromatics
How Do You Make Lawnmower Fuel Last Longer?
When petrol is exposed to air or direct sunlight it begins to break down and becomes “stale”. Always store petrol in a clean, approved plastic container out of the sun. After you mow, if you expect to mower will be standing idle for 2 to 4 weeks, fill the tank after use to minimize the volume of air in contact with the petrol.
Turn the fuel valve to the OFF position and start the engine. Leave it to run until it cuts out, thus cleaning out the whole system avoiding petrol becoming stale in the engine.
If your mower is going to be standing for extended periods you may want to consider using a Fuel Stabilizer. There are various brands on the market, such as Briggs & Stratton or Honda, and each has its own formula for mixing so follow their instructions.
Remember that these fuel stabilizers will not refresh stale petrol, they’ll just slow the process of fresh fuel going stale.
What Can Happen If I Don’t Use The Right Petrol For My Lawnmower?
As mentioned, if the petrol has an ethanol content, we want to limit this to a maximum of 10%. Anything more will cause corrosion and attract water. This will make it difficult to start the engine, it will probably be running rough, and could damage the engine and void the warranty.
The most common issue with stale fuel is that the engine won’t start. But not looking after your lawn mower’s petrol can clog up the internal workings, causing longer term damage to the engine.
Some other good tips to keep your mower running smoothly and avoiding the frustration of difficulty starting or running rough:
- Clean the filter, this is a simple task and will save a lot of wear and tear on the motor.
- Check the spark plug and change it as soon as it shows signs of carbon. This with clean fresh petrol will ensure smooth running action.
If you want more ideas on how to look after your lawn mower, check out these ideas for DIY lawnmower maintenance which could easily save you more than a few bob!
The rules are fairly basic and straightforward. Always use fresh, high-octane petrol, mix with oil in the correct recommended proportions. Do not keep it for long periods in storage, store it in a clean plastic container out of direct sunlight. During long periods of down time, remember to switch the fuel valve to “OFF” and run the system dry through the engine.
Push and self propelled lawn mower engines are fairly robust. They normally work in dusty conditions and are often abused and not taken care of as they should be, but a little TLC can help immensely with longevity.