Hi fellas,Here in Australia we have the choice of two different octain fuels, the standard 90 and the premium 97 octain.I have a 1989 225 jonno that has just been re-ringed and honed.I have finished the break in period with premix and vro with still a little premix left in tank.My mechanic suggested i top up tank with premium fuel until all the premix is used.Do you think this will make a difference?.I suppose the theory is that it will burn cleaner leaving less carbon deposit??.Is it better to run 2 stroke motors on higher octain fuels?.<br />Also could someone please give me the correct champion plug details for this model motor as it is running on NGK plugs at the moment