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RECENTLY WENT TO PRE MIX 40:1 ON MY 787. WHILE THE OIL PUMP WAS INSTALLED I ALWAYS HAD EQUAL PLUG COLOR. NOW THE MAG PLUG IS MUCH DARKER ON RIM AND INSULATOR. THE PTO PLUG IS A PERFECT COLOR. MOTOR HAS 66 HRS COMPRESSION IS FINE. HAVE 4 HRS ON THESE PLUGS. CARBS ARE ADJUSTED TO FACTORY SPECS.
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the color may vary somewhat because when using the oil pump the oil rate varies. Now you are using the amount of oil the engine uses at high rpm.SBT Tech Support is here to help with your problems.
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