1992-1998 Kawasaki PWC Jet Ski Service Repair Manual., Page 75Get this manual
the age-old task of mixing oil with the gas before adding it to the tank, However, additional oil should be added to the fuel during "break-in"period following an engine overhaul or following long storage period''Break-in" Lubrication In order to obtain extra lubrication during the first 10 hours of "break-in", the manufacture recommends premix of 25:1 mixture be used in the fuel tankTherefore, any existing unused fuel in the tank should be removed before adding the premixed solutionThis ratio will ENSURE adequate lubrication of moving parts which have been drained of oil during the storage periodProfessional mechanics who own oil injected units add an extra ounce of oil per each gallon of fuelThe addition of this extra oil may prevent engine seizure in the event of an oil pump failure dog in an oil delivery lineUse only outboard marine oil in the mixture, never automotive oilsFour-stroke automotive engine oil is not formulated to burn