Translations:KAVAN FS400AR - Instruction manual/31/en

Break-in Procedure

AII internal combustion engines benefit, to some degree, from extra care when they are run for the first few times. This process is known as breaking- -in an engine. This is to allow the working parts of the engine time to settle down after being subjected to high temperatures and stress. However, because KAVAN FS engines are made with the aid of the finest modern precision machinery and from the best suitable materials, only a very short and simple break-in procedure is required and can be carried out with the engine installed in the model. We suggest using an 18 x 10 or 20 x 8 propeller for breaking-in.
Start the engine and run it for about 10 seconds with the needle valve set at half open, allowing engine to reach about 6,300 RPM, then open the needle valve to reduce speed to approximately 5,000 RPM and run for 20 seconds at this cooler setting. Keep the throttle fully open, using only the needle valve to reduce speed.
Repeat this procedure, alternately running the engine fast and slow with the needle valve adjustments, while gradually extending the short period of high speed running until the engine has been run at least 10 minutes. Once this minimum 10 minute ground break-in has been achieved, continue break-in in the air.
For the first few flights, set the needle valve as rich as possible, consistent with necessary take off power and, if necessary, readjust the throttle trim on the transmitter so that the engine does not shut off when the throttle is fully closed.
After every flight, close the needle valve slightly until, after at least 10 flights, set the needle valve for maximum power. The carburettor can now be adjusted for optimum throttle performance with the Throttle Valve Adjustments. See next section.