How to Mix Chainsaw Fuel

Two stroke engines require an oil and fuel mixture for the engine to run properly. The reason for this is that most two stroke engines don't have separate lubrication systems, so the fuel has to also provide lubrication to the moving parts of the engine.

One of the reasons that two stroke engines produce more smoke than four stroke engines is because of this—the engine is burning oil as well as fuel. Most modern two stroke engines suggest a 50:1 gasoline-to-oil ratio to power the engine. Some chainsaw operators feel more comfortable using extra oil in their mixtures because it provides additional lubrication, but this could also cause heavier smoke than normal. In any case, you should check your owner’s manual for the recommended ratio, or if you have an old chainsaw, mix a higher ratio such as 40:1 or 30:1 just to be on the safe side.

Here is the process:

1. Get two stroke engine oil, such as Lucas Two Cycle Oil, and unleaded, 89 octane (or higher) gasoline. It's important to use two-stroke engine oil only because it is specially formulated for two-stroke engines to prevent build up in the engine.
2. Measure out your ratio according to the recommended amount. This calculator is a handy way to figure out the exact measurement of oil in ounces you need for the corresponding amount of gas in gallons. The corresponding measurements for 50:1 are 2.6 ounces of oil for every gallon of gas.
3. To mix the solution effectively, you can add half the amount of gas and the full amount of oil to a gas container and shake the container. Add the rest of the gas and shake again. Don't try to mix the oil and gas in the fuel tank of your chainsaw, as it will be difficult to get the measurements right. You will also want to mix more than will fit in your chainsaw's gas tank so you have some extra on hand for refueling later.
4. As an optional step, you can add a fuel enzyme treatment that will stabilize your fuel and ensure that your gasoline stays good for up to 2 years. Many gasolines now contain ethanol, and enzyme treatment will help to stabilize your fuel and prevent problems that arise from ethanol containing fuel.
5. Now it’s time to fill up your fuel tank. There are a few things to remember when fueling your chainsaw:
• Always wipe up any excess spillage on your chainsaw.
• Start your machine at least 10 feet away from where you refueled.
• Always start your chainsaw in a very well-ventilated area.

If you have various cans of gasoline, it doesn't hurt to label the can you just mixed with the ratio to help you remember what mixture you made in that can. You should also always shake the container before refueling your chainsaw because the oil and gas will become separated after the mixture settles.

And if you suspect you need any new parts for your chainsaw to get it up and running, don't hesitate to contact us or visit our store to get everything you need.

How to Break in a Small Engine

When you get a new chainsaw, cut off saw, lawn mower, or other small engine powered piece of equipment, it's critical to break the engine in so it runs properly. The reason behind this is that you want to heat the engine up to seal the piston rings to the cylinder wall, which will minimize friction in the cylinder and prevent oil from gathering in the cylinder wall. For this reason, it's also important to break in your engine again if you replace the piston rings.

So how do you break a small engine in exactly?

1. Fill the engine with the recommended oil

Your owner's manual will specify what type of oil to put in your power equipment. For two-stroke engines, we recommend using Lucas 2-Cycle Semi-Synthetic Oil. Lucas oil is formulated with a blend of mineral oil, synthetic oil, and low ash additives that allows fuel to burn thoroughly for smoother engine operation.

2. Idle the saw for 5 minutes

Start up your engine like normal and let it run idle for a few minutes to get the engine warmed up. You can rev the engine a bit to keep it from shutting down, but you want to make sure the engine is warmed up before running it normally.

3. Run the engine as normal, but not at full throttle

For at least 5 hours, you will want to run your engine as normal but don't hit full throttle just yet. If you do run your engine at full throttle, you risk deformation of the cylinder bores. After this period, it's okay to run the engine at full throttle when it has a load. Many chainsaw operators recommend only running the saw at full throttle when the saw is in the cut, for example.

4. Change the oil

Some chainsaw operators and technicians recommend changing the oil in a new saw after an hour of operation. Most new saw owner's manuals will tell you to change the oil after 5 hours of operation. If you want to be extra safe, you can do both, but generally speaking, changing your oil after 5 hours is sufficient. The reason for this oil change is to remove any tiny debris that has broken away from the engine components and remained trapped in the oil.

Once the saws oil has been changed after the 5 hour threshold, your saw is ready to use regularly and at full throttle. Many technicians and small engine experts have their own methods of breaking in their engines. Please leave your comments with your own method!

HLSupply provides small engine parts for chainsaws, mowers, cut off saws, and more. Visit our store for our complete selection of parts including cylinders & piston rings.