Hello, I have a 2000 sportsman 500, and one day i pull it into my garage, put it in neutral, and this terrible noise started coming from the bottom of my engine. It sounds like a grinding spinning motion, It will change from loud to quiet, depending on if i put the choke on, and if i give it gas. the engine itself idles and runs fine, but that noise cannot be good. Don’t know if it is an oil pump or what? If i had to pin-point a specific location, it would be right at the base of the engine where the hoses that run from the oil pump enter the engine, but i don’t know if that is where it is coming from. Thanks