I always do three heat cycles on an engine when I rebuild it. Run it long enough to get to operating temp at varying throttle positions, then let it cool down. Repeat 2 times. Then the first tank of gas, take it a little easy. Change the oil and readjust the valves. After that, anything goes. Just from my experience, I have found that the oil rings tend to seat in better this way.
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2005 Hammerhead 150
170cc BBK, PnP Big valve Head, A12 Cam, Uni Filter, Custom Exhaust, 10G rollers, 1500 Contra Spring, 2000 Clutch Springs
Just added - 2007 Joyner 250 SV - Let the fun begin
4-Dirt Bikes, Baja Bug and enough toys to keep me in the garage and out of trouble.
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