Send him a message, he's got a few scooters he rents on the side. I rented from him when I was in Phuket last year, had a PCX for 2500 a month. I know he had a couple clicks, worth a shot asking.
Growing a business with a friend? You'd need a Non-B visa and you'd have to apply for a work permit. Your position cannot be a prohibited profession and the company needs to employ 4 thais for every 1 foreigner.