Re: powerhead break in question, '93 88hp Johnson
OK, if you are running with a VRO oil pump, fill oil tank with oil. Mark a line where the oil is at in the tank with a thin-line permanent marker. fill fuel tanks with pre-mix (50:1) 16ozs. per 6 gal fuel.<br />First 5-10 min. at fast idle, 1500RPM. Check operation of water pump, strong stream from tell-tail.<br />First hour, get on plane, but do not exceed 3500RPM.<br />Hour2: bring boat up to planing speed and back off throttle to 4000RPM. during this second hour, every 5 minutes, or so go to wide open throttle for a period of 45 seca. to 1 min. backing off to 4000 rpm between intervals of WOT.<br />Hours3-10: avoid full throttle operation for periods in excess of 2 minutes, and vary engine rpm every 12-15 minutes through-out the RPM range.<br />After hour 10: check oil level in VRO tank to see if oil is being consumed.<br />NOTE: If you are using premix only, mix at 25:1 for the first 10 hours, and 50:1 after that period.<br /> If verification of oil use is made from VRO tank, refill to mark, and run straight fuel in tank.<br />At approximately 10 hours, retorque Cylinder head bolts after running, but has cooled to the touch.<br /> It is not stated in the manual, but for the next 5 hours after this, I never run WOT for more than 5 minutes at a time, until after 15 hours.<br />Prop as needed to acheive approximatly 5800 RPM with a light load at WOT. 6000RPM with the same load would be even better.<br />Hope this helps, and I would recommend a good quality oil, such as Johnson/Evinrude XD-25, although there are other great oils out there, I recommend Factory only oil for the first 25 hours, and in my case, the life of the engine.<br />Good luck!
