For anyone interested, I bought a Honda BF150 Service Manual searchable PDF from a source in the UK off E-Bay for around $15. It works and appears to be the real deal. Here's the link:
http://www.ebay.co.uk/itm/Honda-BF135A- ... OU:US:3160
http://www.ebay.co.uk/itm/Honda-BF135A- ... OU:US:3160