Mike,

This is the way my team mate starts his DZ seriously, he rotates the engine from the spnner not the blade and engine starts at once, not reccommended of course as it is dangerous. The safest way to start YS engines is by using a starter

Here is a relevant thread:

[link]http://www.rcuniverse.com/forum/m_7830399/anchors_7833528/mpage_1/key_/anchor/tm.htm#7833528[/link]