ORIGINAL: DarZeelon
You are also supposed to lean it ASAP, to 400-500 RPM rich of max
This is incorrect. The mixture should be set to a point just beyond where it begins to 2 cycle.
Please read your own [link=http://www.rcuniverse.com/forum/Tapered%2DBore_Engine_Break%2Din_%2D_Upgraded/m_1850473/tm.htm]tapered-bore break-in thread[/link] again.