Translations:KAVAN FS400AR - Instruction manual/24/en

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Fuel

For consistent performance and long life of the engine, it is advisable to use good quality fuel containing not less than 18% lubricant, castor oil preferred, until a total of 1 - 2 hours of break-in has been achieved. Once break-in has occurred, the running characteristics of the FS 400 can be improved using a slightly lower lubricant content fuel, however, it may also shorten engine life. See Chart for Fuel Specifications:

Break-in
10-15% Nitromethane
18% Castor Oil
67-72% Methanol