predator 79cc

I know you can make a predator engine sit upright if you add a bit more oil, but how far can I move it past that upright position before there's a performance or oiling problem?

Hello there, I am new to gasoline powered bikes, Years ago i built a Lithium brushless, but got out of it. I just want to cruse on a motorized bike, simply and not get too involved. Speed doesn't matter just a little engine roar, ill be pedaling the whole time as well with it. System must be 4...

I bought a 79cc harbor freight predator engine despite my Dad's warnings that it would never fit in my frame, he was wrong, but only by 3 millimeters (actual figure, I measured)... here's some pics... http://imgur.com/a/MguAc