What is going on here is this: He's a professional scammer in some west African country, and his poor use of the English language is due to the fact that he speaks French, and is using Babblefish to translate his come-on.

If you stop to think about it for a minute, things just don't add up. Where on earth does somebody get an American cashier's check in Africa??

What these guys are doing is sending counterfeit cashiers checks (always for more than the price you were asking), and are counting on your greed to blind you to the truth of the matter. Most of the time, US banks clear a check into your account before they have actually recieved payment. You see money in your account, you ship the stuff, then about 2 days later, the bank retracts the money. By then, your bike is on some tramp steamer to an african port.