When I turned the engine by hand, it was not stuck. The boiler B2F has some settling on the O-ring. A spare O-ring is also included. Also, I can't find the parts circled in red in the last photo.This item is in the category "Toys & Hobbies\Radio Control & Control Line\RC Model Vehicle Parts & Accs\Engine, Exhaust & Fuel Systems\Gas/Nitro Engines". The seller is "jp_colors" and is located in this country: JP. This item can be shipped to United States, all countries in Europe, all countries in continental Asia, Canada, Australia.