Turns smoothly and has good compression. Missing a few groves on the prop hub.Does not affect performance in any way. Please make sure this engine is what you want and desire. I would be happy to answer any questions. This does not apply for buyers from USA and Canada. The item "Saito FA-90T Twin Four Stroke 2 cylinder R/C Glow Engine Model Airplane Motor" is in sale since Wednesday, July 24, 2019. 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 "malaprasica2004" and is located in Surrey, British Columbia. This item can be shipped worldwide.