Your local library is a good source for outboard repair manuals including the wiring diagrams. Most libraries now are on a network with area or Statewide libraries and books can be sent directly to you.
If, when you look at the stern of your boat, there is nothing bolted to the transom, that is generally a good indication that your outboard has been stolen.
the 20hp Mercury outboard motor runs at the most at 8mph on a good 14ft to 16ft aluminum boat. Mercury.co
You can purchase a Yamaha outboard motor online at www.ebay.com. Also if you have a Yamaha distributorner you,it is possible they carry used motors
fuel oil mixture 40:1 a good rule is to mix all outboards no matter what horse power a pint to 5 gallons
What is the value of a good running 1972 100 HP Johnson out board motor
E-how.com has been there for me in many of my must learn situatations. Ehow is also a good place to start searching for information on outboard motor maintanance. http://www.ehow.com/way_5468513_mercury-outboard-engine-maintenance.html
What is the value of a good running 1972 100 HP Johnson out board motor
Depending on the motor you can use Max Rules. They have a pretty good database for years and hp info.
anything over 100 on all cyl is fine and a good motor
Jet ski
If it's in really good condition, about $250.