Thanks guys for all your input.I'd use 15% fuel on this engine will try 30% if it's not better I think I'll try the 120 2cycle although I like the 4 cycles more but over here in South Africa the OS and Saito 4 cycles are much to expensive right now.
Thanks again.

You will like the OS120AX. I ran 15%nitro and an APC16.5X5W prop

Look at RCU classifieds
often you can buy new in box engines at a good discount

New is nice,you get full warranty.. or you could try something like this if on tight budget

http://www.rcuniverse.com/market/item.cfm?itemId=488194

My MVVS 26 IFS weighs 38 oz with ignition and the measured thrust with a Mezjlik 18X6 CF prop is 18 lbs. (with a pipe you can get well over 20lbs) It burns about half the fuel per min. that my Saito 180 does so I only run a 12 oz tank instead of the 24 needed on my 180 saving roughly 3/4 lb in fuel weight. I have mine in a Sig Mayhem at the moment and I am more than pleased with the performance. It hovers at less than 1/2 throttle and punch out is great. I confess that I haven't tried it in anything like the plane mentioned but I thought the numbers I had might help out some. Good luck with whatever you go with.

just breaking in my mld 28 and after 30oz of fuel getting a peak of 17lbs of thrust on a xoar 18/6 and the weight is exactly what is advertised on mldengines website. not bad for $265.

My Saito 125 pulls an 7-8 lb plane around great does use the fuel but man the power is awsume on this. My 180 pulls a Sundowner or did lol weight of around 13lbs. was not as fast as I wanted but faster than the pilot. The 125 has a 16x8 Master AirScrew and same on the 180. The 180 on this size plane to me could be bigger, but flew it good and done all i could do just speed was from 84-93 depending on wind and stuff when it came by radar.