1992-1998 Kawasaki PWC Jet Ski Service Repair Manual., Page 51Get this manual
TROUBLESHOOTING
test is the variation in pressure reading between cylindersIf greater varadon exists, then the lower reading cylinder should be checked by making cylinder leak testA simple and fairly effective leak test can be made by first inserting teaspoonful of oil into the spark plug opening of the lower reading cylinder, and then cranking the engine few times to distribute the oilCheck the compression again to see if inserting the oil caused changeThe oil helps make temporary seal around the rings and increases the compression, If the reading increased, the compression loss was probably due to worn ringsIf the reading did not change appreciably, the loss may be due to blown head gasket5-2 MECHANICAL ENGINE PROBLEMS