Weather permitting it will probably be maiden next week.The plane ended up needing some 250 grams and the 5 cell battery placed right behind the prop under the engine in order to get the c.g correct. All up weight stands now at 3.7 Kg. I guess YS 70 will do the job. All my 4 stroke engines run on 10:20:70 fuel including the Ys .I only use synthetic oil in the mix(20%) .Avoiding caster is a must for the Ys engine as it messes up with the diaphragm .Synthetic oil is also used for after run protection .