I have mounted an OS 200 on a 74" Extreme Flight Yak and all I can say is WOW

...What a fantastic combo...Not sure of the exact weight but it'll be all of 11 lbs.
I am running it with a Mejzlik 18/8 @ 8600...Fuel consumption is very very low...It pulls this plane around like a rag
I have run Saito engines for years but I really like this engine...Very quiet, smooth and seems to be be quite powerful