no clue on manual purchase. My method of motor maintenance is do the simple stuff myself (ie lower unit oil, engine oil/filter) and anything that requires a manual I leave to the marina or the kind folks on this board. Thankfully, the last 2 engines I have owned on my "main boat" have both been amazing. Only ever brought them in for impeller changes (and even that maintenance I have been tempted to do myself...lots of stuff on youtube can walk you right through it)