Pete, here is an excerpt from the instructions.
("Breaking-in")The recommended procedure is as follows:Use the same fuel and prop as you intend for flying your model.1.2. Open the needle-valve 2.5-3 turns from the fully closed position and start the engine.3. Open the throttle slowly to the mid speed position, and disconnect the current to the glowplug.4. Now open the throttle slowly to the fully opened position and run the engine for no more than 5 seconds with the needle-valve tuned to produced near maximum r.p.m.,then, immediately, slow the engine down again by opening the needle-valve approximately one turn. The rich mixture, so induced, will cool the engine, at the same time providing increased lubrication.All internal-combustion engines benefit from extra care when they are run for the first few times known as running-in or breaking-in. This allows the working parts to mate together under load at operating temperature.Therefore, it is vitally important to complete the break-in before allowing the engine to run continuously at high speed and before finalizing carburetor adjustments. However,because O.S. engines are produced with the aid of the finest modern precision machinery and from the best and most suitable materials,only a short and simple running-in procedure is called for and can be carried out with the engine installed in the model.5. Repeat this process, alternately running the engine fast and slow by means of the needle-valve, while keeping the throttle fully open, then begin to extend the short periods of high-speed operation until two tanks of fuel have been consumed.
Diesel fuel in my area is 10 cents per gallon lower than the 87 octane.
Last edited by Hobbsy; 06-07-2016 at 04:06 AM.