Interesting two cylinder, four stroke, rare single valve model aircraft engine, I would imagine its 20 or 25cc? I see no reason why it can, t be used again maybe with modern ignition fitted. The item "Model flat twin rare single valve four stroke petrol engine" is in sale since Thursday, December 17, 2020. This item is in the category "Toys & Games\Radio Control & RC Toys\RC Model Vehicle Parts & Accs\Engine, Exhaust & Fuel Systems\Petrol/Nitro Engines". The seller is "rollsron" and is located in Rustington .This item can be shipped worldwide.