It's this easy:
Oil change - 15W40 Quicksilver Oil, Oil Filter & Fuel Filter/water separator - all carried at WalMart for maybe $35 total. You'll need an oil pump (one time purchase for $20-50) to make the job easy).
Walter V-Drive oil change - 1 qt. 30Wt Oil anywhere. I couldn't get the pump to suck out much so I used the drain plug at the bottom of the V-Drive unit. E-mail/PM me if you want a schematic/location description I found on the internet of where the plug is located, and where to fill.
Trans Fluid Change - 2 qts ATF III, anywhere, maybe $10. Suck out the old stuff with your pump, re-fill in the same place.
Plugs if it's been 500 hours I believe. I bought on e-bay (AC 41-993, replacement for 41-932) for $46 total. NAPA or Kragen might be $10-20 more than this.
Clean spark arrester (air filter) with water, soap & toothbrush. Cost nothing.
Check the belt for cracks, etc. (mine was replaced last year).
That's pretty much it. Having now figured it out the first time, it will take me half the time next year. Again, PM me if you want an e-mail with the 350 Mag and Walter V-Drive owner's manual.
... Oh and the impeller which was done last year and I haven't had to figure out yet. Can't be that hard and there's plenty of expertise on this board for how to get that done. Impeller cost, probably $20.
(Message edited by ottog1979 on February 25, 2009)