Overhead valve, 4 cycle, glow ignition Displacement: 90cc / 5.49cu.in Stroke 26 mm Bore 26 mm RPM Range 800/1000 min. - 5200 max. Weight 4,2kg - including engine mount and custom made exhaust collector ring Power output: 8/10 Hp Propeller: 24x6/8/10 Glow Fuel: 90% Alchool. 10% Castor oil for break in, 7 % after break in, 5% Nitromethane can be added Glow plug: OSF 4 stroke Electronic ignition with li-po battery to provide a consistent current to the glow plugs