What is the fuel-oil mixing ratio for the CS 35 and how to properly prepare the fuel?

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The McCulloch CS 35 chainsaw is equipped with a two-stroke engine that requires a fuel-oil mixture at a ratio of 50:1 (2%). This ratio must be precisely followed to ensure the proper functioning of the engine and its durability.

Mixing proportions:

5 liters of gasoline = 0.10 liters of oil
10 liters of gasoline = 0.20 liters of oil
15 liters of gasoline = 0.30 liters of oil
20 liters of gasoline = 0.40 liters of oil

Use a high-quality unleaded gasoline with a minimum octane rating of 90 RON (87 AKI). The gasoline can contain up to 10% ethanol maximum. Using gasoline with a lower octane rating may cause engine knocking and damage the engine. You may also opt for McCulloch alkylate pre-mixed fuel, which offers better energy efficiency and contains fewer harmful chemicals.

For engine oil, prefer McCulloch two-stroke oil or a high-quality two-stroke oil specifically formulated for air-cooled engines. Never use outboard motor oil or four-stroke oil, as these products are not suitable for your engine.

Fuel preparation procedure:

Pour half the volume of gasoline into a clean container
Add all the oil
Shake the container vigorously to mix
Top up with the remaining gasoline
Shake gently one last time to ensure thorough mixing

The fuel tank of the CS 35 has a capacity of 1 liter. Prepare the fuel in small quantities and never store more than a month's supply, as the mixture ages quickly. Before each use, carefully pour the fuel into the tank and ensure that the mixture is well homogenized by shaking the container.

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