Stihl HL 90 Product Instruction Manual - Page 16

266BA028 KN English unit with incorrect idle adjustment. At correct idle speed, the cutting tool should not move. If your power tool shows an incorrect idle adjustment, have your STIHL dealer check your power tool and make proper adjustments and repairs. The idle speed and maximum speed of the engine change if you switch from a fuel with a certain ethanol content to another fuel with a much higher or lower ethanol content. This problem can be avoided by always using fuel with the same ethanol content. Use STIHL HP Ultra oil or ask your dealer for an equivalent high quality oil to ensure the maximum performance of the product for the full lifetime. To meet the requirements of EPA 40CFR90/1054 we recommend to use STIHL HP Ultra oil. Do not use BIA or TCW rated (twostroke water cooled) mix oils or other mix oils that state they are for use in both water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.). Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the container from your vehicle and place the container on the ground before filling. To reduce the risk of sparks from static discharge and resulting fire and/or explosion, do not fill fuel containers that are sitting in or on a vehicle or trailer. The container should be kept tightly closed in order to limit the amount of moisture that gets into the mixture. The machine's fuel tank should be cleaned as necessary. Fuel mix ages Only mix sufficient fuel for a few days work, not to exceed 30 days of storage. Store in approved fuel-containers only. When mixing, pour oil into the container first, and then add gasoline. Close the container and shake it vigorously by hand to ensure proper mixing of the oil with the fuel. Gasoline Oil (STIHL 50:1 or equivalent high-quality oils) Liters 1 5 10 20 Liters 0.02 0.10 0.20 0.40 (ml) (20) (100) (200) (400) US gal. 1 2 1/2 5 US fl.oz. 2.6 6.4 12.8 Dispose of empty mixing-oil containers only at authorized disposal locations. Fueling Preparations N Before fueling, clean the filler cap and the area around it to ensure that no dirt falls into the tank. Always thoroughly shake the mixture in the canister before fueling your machine. N Position the machine so that the filler cap is facing up. WARNING In order to reduce the risk of fire and personal injury from escaping gas vapor and fumes, remove the fuel filler cap carefully so as to allow any pressure build-up in the tank to release slowly. 14 HL 90 K