You'll have better results searching "Mark 1.80" on google. Same engine, same manufacturer, just a new name to get around a distribution dispute. Hobbypeople.net should have a manual to download.

EDIT: just checked hobbypeople and they dont have the manual. I have it here in front of me but have no way to scan it for you.

I bought mine used and it has run perfect for me without ever having to touch the low end 'knob' so I can't help you there. I can tell you that yes, mine back-flip starts every time.. Prime it well then ignite the glowplug and one quick flip backwards get her running.. 1 out of 5 times it will start running backwards, but a quick tap on the kill button or jiggling the throttle at low idle always gets it running forward again.

An 18x6 was giving me around 9300 rpm so a 16x10 should scream on the right plane.