Now I am using one 4.8v ign. pack, 6v, and regulator gone. No difference.

If the ignition fails would it work at all? The plane starts, idles great, when throttle is applied I get the RATATATATATATATATAT..... nothing else, the the motor starts back firing, and spiting until the throttle is lowered back to idle and then it is fine, until throttle is applied again.

I also asked a couple companies who sell this engine, parts etc... about its comepression, they said it is not a high compression anyway. It does have compression, but I am used to a 1/4scale HPI baja with a 2-stroke gas engine, when you start that, if youdo not hold the buggy down you will lift it right off the ground, and it weighs at least 20lbs.

Grrr......This sucks!