Stihl MS 201 T C-M Instruction Manual - Page 15
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Fuel This engine is certified to operate on unleaded gasoline and with the mix ratio 50:1. Your engine requires a mixture of highquality premium gasoline and highquality two-stroke air-cooled engine oil. Use premium branded unleaded gasoline with a minimum octane rating of 89 (R+M)/2. Note: Models equipped with a catalytic converter require unleaded gasoline. A few tankfuls of leaded gasoline can reduce the efficiency of the catalytic converter by more than 50%. Fuel with a lower octane rating may result in preignition (causing "pinging") which is accompanied by an increase in engine temperature. This, in turn, increases the risk of the piston seizure and damage to the engine. The chemical composition of the fuel is also important. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines etc.), but magnesium castings as well. This could cause running problems or even damage the engine. For this reason it is essential that you use only high-quality fuels! Fuels with different percentages of ethanol are being offered. Ethanol can affect the running behaviour of the engine and increase the risk of lean seizure. Gasoline with an ethanol content of more than 10% can cause running problems and major damage in engines with a manually adjustable carburetor and should not be used in such engines. Engines equipped with M-Tronic can be run on gasoline with an ethanol content of up to 25% (E25). Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke aircooled engine oils for mixing. We recommend STIHL 50:1 two-stroke engine oil since it is specially formulated for use in STIHL engines. Do not use BIA or TCW (two-stroke water cooled) mix oils! Use only STIHL 50:1 heavy-duty engine oil or an equivalent quality two-stroke engine oil for the fuel mix in models equipped with a catalytic converter. Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapour. The canister should be kept tightly closed in order to avoid any moisture getting into the mixture. The fuel tank and the canister in which fuel mix is stored should be cleaned from time to time. Fuel mix ratio Only mix sufficient fuel for a few days work, not to exceed 3 months of storage. Store in approved safety fuel-canisters only. When mixing, pour oil into the canister first, and then add gasoline. English Examples Gasoline liters 1 5 10 15 20 25 Oil (STIHL 50:1 or equivalent high-quality oils) liters (ml) 0.02 (20) 0.10 (100) 0.20 (200) 0.30 (300) 0.40 (400) 0.50 (500) Dispose of empty mixing-oil canisters only at authorized disposal locations. MS 201 T 13