My first bike was an LT80. Had the oil injection but after about a year of riding it I remember it ran REALLY good one day, then it stopped running. The oil injection went out and it burnt up.
If it's working then that's good but keep a real good eye on it. You really can't tell it's working while you're riding, ya know? It's one of those things that you don't know it's gone until it's too late