I received a similar scam for my Top Gun in the classifieds a few weeks ago. He played me with negotiations for over a week. He did know a little about engines, etc. He was real clever, but not quite smart enough.
I requested a wire transfer and he said no problem, but later insisted his Cashier Check would be just as good. His bank was closed for the holidays, etc. and then wire fees from Europe (England) were expensive?? I stated wire transfer only or no deal and he squirmed for a couple days trying to convince me otherwise, only to never hear from him again....
I was advised to open a separate account to accept the wire transfer. As soon as the funds are received, immediately transfer the funds to your regular account and close the temporary account. This way the other "bank" has no way to reclaim the funds.
The trick is to actually have the scammer wire the funds....I haven't been that lucky. Hope this helps.