Quick Checklist


  1. Use Chevron or BP brand premium grade gas. Use E-10. Do not use non-ethanol gas unless it’s sold at every gas station and you’re sure it’s fresh.  Many Rotax engines are damaged by “old style non-ethanol gas,” by detonation.
  1. Use Amsoil Interceptor oil @ 40 to 1 ratio. This is a must to protect your warranty. Quicksilver PWC oil can also be used. If using oil injection you must add 3.2 ounces of oil per each 5 gallons of gas to your aircraft’s fuel tank.
  1. Max water temp is 195 degrees F on takeoff. Max cruise water temp is 175 degrees F
  1. Maximum EGT temps is 1200 degrees F. Best EGT temps are 950 to 1150, with 1050 perfect. For the Rotax 503 ONLY, maximum CHT is 400 degrees F.  Most run between 275 and 350 degrees F
  1. Only use green antifreeze. Do not use orange Dexcool. If you have a head o-ring leak into the combustion chamber this can cause crankshaft failure.
  1. Warm the engine as soon as it starts @ 2500 RPM for 2 minutes, then @ 4500 RPM for 4 minutes, and finally 1 minute at 5000 RPM. THIS IS VERY IMPORTANT.  You’re not just warming the water, you’re expanding the cylinders. Try not to run the engine below 4500 RPM after the warm up is completed so that the cylinders stay expanded.  Your warm up time may need to be longer in cold temps.
  1. Engines purchased have a 2 year warranty. Overhauled engines get a 1 year warranty.  The stators on purchased  engines have a 90 day warranty.
  1. Do not use gas over 2 months old.
  1. Regardless of what is said in #1 above, do not run ethanol gas in aircraft that have fiberglass fuel tanks. The polyester resin will break down and destroy the engine. You must use AVGAS 100 LL, which can be mixed 50:50 with non-ethanol, to lower your costs. Other than that, 100LL is the best gas for your engine (regardless of your fuel tanks composition).
  1. Your engine comes with the 1 hour run in completed. BUT for the next 5 hours you should only use full throttle until you clear the trees or obstructions on takeoff. If you have a long runway just use full throttle until airborne.  Your pistons will size down during these 5 hours.  The clearance is on the tight side until this happens, and you could scrape off the cross hatching.  ALSO, keep in mind that 90% of the engines that fail happen while the engine is running at full throttle.