This is my first post here. I bought a 2005 sportsman 90 for my son. It wasn't running very well when i got it. I replaced the top end, reed valve and intake tube. I also replaced the secondary jet (at least that's what i think its called, the smaller one). After that it now runs amazingly,,, for about 10 minutes, then it doesn't. I haven't been very close when it dies, but my son says that it doesn't seem to lose power before it dies, it just shuts off. It'll start right back up, either by the starter or kicking. It'll run just enough to get out of the woods and into my driveway most of the time, about 300 yards, then it usually quits again. Sometimes it'll restart after that. Sometimes it has to sit for a bit. Regardless it won't continuously run. I disconnected the oiler tube and have been running a 40:1 premix. That being said I didn't plug the oiler port on the carb, actually just thought of that, but can't imagine that would be doing this. And thoughts or trouble shooting ideas would be greatly appreciated.