The most critical item that requires break in is a flat tappet cam. They usually come with assembly grease, or a recommended grease to apply to the lifters and cam lobes. In addition, a diesel oil with zinc additive is helpful.
What a new cam and lifters does not like is extended cranking, running dry and no oil pressure until the galleys fill, and idling!
Prime the oil system, set the timing, check the spark and fuel, have it ready to bust off ASAP, and bring the RPM up, typically full governed speed on a tractor engine.
Of course you want to watch the oil pressure, temp, leaks, listen, make sure the rockers are oiling, etc., but try to keep the RPM up for at least 20 to 30 minutes. Then shut it down, retorque the head bolts, check the valve lash.
Once it goes to work, try not to fully load it for extended time until the rings have time to seat, avoid idling. The break in oil needs to stay in by the mfg recommendation, or about 1/2 the normal oil change period.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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