Its rotation direction reversible control. Crankshaft diameter of 5 mm.Engine size: length 110mm, width 90mm, high 100mm. The displacement is 1.85 cc. The cylinder diameter is 14mm, and the stroke is 12mm. This item is in the category "Toys & Hobbies\Powered Toys\Steam Powered". The seller is "jinsteam" and is located in this country: CN. This item can be shipped worldwide.