Obviously everyone is going to say something different and at the end of the day you are going to do what you think is best. Myself and a few friends of mine with PB's have chosen this way : The first three tanks of fuel you go through are to run the bike in, at a ratio of 25:1, using Castrol Activ2T which is a Mineral Based 2 Stroke Oil readily available in any Super Cheap Auto or Repco store, with (if in Australia) BP Ultimate 98 Octane Fuel.

After the bike is run in, change the ratio to 50:1 (although thinking of going back to 40:1) using Castrol TTS which is a full synthetic 2 Stroke Oil, and as above BP Ultimate 98 Octane Fuel.

Another tip: Why use Lawn Mower oil? Are you riding a lawnmower. No. Stick to Motorcycle 2 stroke oil. Myself and my mates have used this formula since day dot of owning the bikes and have had no problems whatsoever.

Hope this helps guys.