A few things to remember about servicing your machine!
1- Check and clean your air filter often. Especially an atv. They are usually always ridden in dusty conditions. A dirty airfilter can cause porr performance, poor fuel economy, and also damage an engine.
2-Change your engine oil at least every 6 months. Most riders don't put enough miles on in a year to follow the milage chart in the maintenance schedule. Oil does breakdown with time...just like in a car, and should be changed at least every 6 months.
3-Check your tire pressure. Low tire pressure or over-inflated tires are the most common problems with drivabiltiy problems. 1psi can make your machine feel like a whole different animal. Always keep your tire pressure at the reccomended levels.