I got an 08' Vector and do nothing...................oil has been changed a total of 3 times, carbs cleaned 1 time, still have stock plug in, I grease the skid in Oct-Nov yearly, never did anything to the stock battery - but had some problems with the battery " got new " this season so I will trickle that every couple month this year, I run the good gas in it during the season non-ethanol, I have an easy lift so skid is off the ground, and I will start it every couple of month, again I have a vector tho.
Only problems I've had are normal, speed o bearing went, donuts had to be changed, exhaust got a crack and got replaced, bearing in boogie wheels, sled has 6500 miles.