I have owned my 580 since 99. As soon as I bought it i had problems with it it. I would be able to drive it between 15mins-2 hours and suddenly it would bog down and have no power. It seemed if I played with the throttle alittle it would go alittle ways then I would have to repeat the process. Sometimes it would just not move at all because of no power, yet it seemed to idle ok when all this happened. Since 99 I have cleaned the carbs a billion times, rebuilt the engine, and tried my best to check over the electrical. To this days it still does it, it will be fast and well running until it hits that point and starts bogging. I could trash the damn thing it pisses me off so much, but yet I love the sled because when it runs correctly it is damn fast. What I am wondering is if anyone has an idea of where I should start now with trying to figure out whats wrong. Any help at all is extremely appreciated.