My Moki also starts backwards on occasion. The best way to start I've found is to back-flip it. It doesn't take a whole lot of pressure either.
I've found If it's starting backwards, I'm back-flipping to hard, when all it takes is a good follow through. Not very hard, just a firm follow through with a chicken stick, and away she goes. It does need a sip (prime) or 2 of fuel sometimes though, those Moki's really like thier fuel.

I run an OS type F plug, and alchy(methanol) fuel from the go-kart shop that I add blendzall(castor/synthetic) oil. I run 17% oil, and it doesn't miss a beat. I've heard guys are dropping to 14 and 15%, that's OK. I just like a little more lube, and it's decently easy to clean up. Mixing fuel like this costs around $7.50 a gallon, that's nice when the thing goes through a gallon in about 7 or 8 flights.