What year is the Yam? Have a look on ebay,you should be able to get a CD manual for it for about a fiver.
Service is pretty simple.
Plugs, timing check (if it's even adjustable) lower unit gear oil (use new drain/fill plug gaskets EVERY time), new impeller, check freeplay in cable, grease every linkage you can, greasegun on every grease nipple.
Prop off, grease splines, replace.Use decent marine grease on everything.
Don't overgrease the driveshaft wher eit goes into the powerhead, and don't lose the key on the impeller shaft-it may fall out when you remove the impeller.
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