Yamaha 8C Owner's Manual

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Contents

3-9EEMU00226Run the engine under load (in gear with apropeller installed) as follows.1) First 10 minutes:Run the engine at the lowest possi-ble-speed. A fast idle in neutral isbest.2) Next 50 minutes:Do not exceed half throttle (approxi-mately 3,000 r/min). Vary enginespeed occasionally. If you have aneasy-planing boat, accelerate at fullthrottle onto plane, then immediatelyreduce the throttle to 3,000 r/min orless.3) Second hour:Accelerate at full throttle onto plane,then reduce engine speed to three-quarter throttle (approximately 4,000r/min). Vary engine speed occasional-ly. Run at full throttle for one minute,then allow about 10 minutes of opera-tion at three-quarter throttle or less tolet the engine cool.4) Third through tenth hours:Avoid operating at full throttle formore than 5 minutes at a time. Let theengine cool between full-throttle runs.Vary engine speed occasionally.5) After the first 10 hours:Operate the engine normally. Use thestandard premix ratio of gasoline :Oil. (Refer to “Gasoline/Petrol and OilMixing”.)Break-in (running-in) time:10 hoursBreak-in (running-in) premix ratio:Refer to “Gasoline/Petrol and OilMixing”.