Following these steps will ensure the maximum reliability, performance & longest life from your engine. A few prerequisites before we start. To meet the above performance & reliability goals, your engines needs the finest quality helicopter fuel available. Good heli fuel provides proper cooling through the use of special oils that can withstand our extreme demands. If you are still looking for a good fuel, FSRC has had good experiences with Red Max Heli blends, both 15% and 30%. Other national brands work too. Ask your local expert which brand has worked best for them. The most important thing is to have enough oil. General rule of thumb is at least 17% to 18% total oil, by VOLUME. Good heli fuels with 30% nitro use more oil than the 15% blends. All ABC / AAC liners / pistons can be run with either 100% pure synthetic, such as Klotz KL-200, or a castor / synthetic blend, such as KL-100, if you are mixing your own fuel. The first place the quality of the fuel will show up is on the glow plug element. A new plug on a well set up & properly broken in engine will maintain 95% of its gloss after one flight. Ashen or grey color means the needle is too lean or that the cooling air flow is inadequate. Also, the plug may be the wrong heat range for your particular fuel nitro / exhaust system. Please see our engine set up matrix for you specific needs based upon your choice of fuel & exhaust system. Make sure to install the double glow plug washer set ups on the SX61 where noted in the set up matrix. FSRC recommends Enya #3, OS #8, or Hobby Shack #3, an Enya #3 clone.