I agree with Horace you probably had fuel left in the tank and may have stored the model nose down. There's nothing to stop fuel running out the front of the crankshaft other than the very small clearance between the crankshaft and the crankcase. It's quite normal even for a ball raced engine but I think yours is plain bearing in which case you shouldn't be using Coolpower fuel. Plain bearing (bushed) crankshafts need at least 20% oil and the more castor the better. Ideally they need 22% all castor for very long life.