You need a few tools and Andy at SIM has the manual, YDS software and parts at low prices plus outstanding tech support by email and on the Hull Truth He posted several tutorials on the 225 at
http://www.simyamaha.com/Yamaha_Outboar ... s/1806.htm and maintenance check lists
The basic steps are applicable on other motors
m2cw is not purchase the manual and software now. I would buy some Yamaha oil, fuel and oil filters, and lower unit fluid, extra washers, etc from SIM and take advantage of the $9.99 shipping fee.
I think you should purchase the 2 VST filters, VST O-ring and a couple of inside the motor fuel filters so you will be prepared.
Shop locally for ring free, Sta-Bil, etc fuel storage and maintenance fluids. If you don't have a Racor fuel and water filter before the motor, install one and change on a regular schedule. I just bought NKG plugs form Auto Zone locally for $4.29 each vs $7.50 online.
Ask the counter person if he will throw a free gap tool
Mr Funnel fuel filter is useful when adding gas to remove debris. A tube of dielectric grease is useful along with Tripe Guard grease Dale has recommended. A decent grease gun (full size with flexible hose or mini) will last for years and purchase marine grade grease. I replaced the motor flush attachment (ear muffs) with a Moeller that has larger cups and dual water feeds for $22. Discard the wing nuts on your batteries and replace with nuts, washers, etc, Just the search the site on batteries. Clean the battery terminal and your favorite corrosion block. Buy an inexpensive digital volt meter which has multiple uses. If you spend money up front, you will save a lot of money