Re: COMPRESSION READINGS FOR 79 EVINRUDE 85 HORSE
E/J didnt state specific numbers in the service manual. They do state the compression should be no more than 15 lbs different. Several things will have an effect on your readings.<br /><br />If the motor has not been run lately the cylinders will be drier than if it had just run. Gauges vary. If the cylinders are consistant side to side but the sides, as a whole, are slightly different then there may be two different heads on the motor. The battery must be up and fully charged. The starter should be in good working order.<br /><br />Basically we are looking simply for a comparison and a baseline.
