1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 50Get this manual
Power head mounting bolt The power head can be removed by simply removing the securing bolts Remove the dowel pins from the bottom cowling or power headTo protect the dowel pins against damage, cover them with rags while removing
The power head may be difficult to separate from the bottom cowling because of stuck gasket holding them togetherIf this is the case, pry it off the bottom cowling with piece of woodUse care not to damage the bottom cowling or power head with the woodAfter removing the power head, insert the crankshaft into the engine stand that has been secured in vice on bench