I have a 2007 Suzuki 700 KingQuad ATV with 15 hours riding time on it and when I ride it for about 20 minutes?

[srfam1]

I have a 2007 Suzuki 700 KingQuad ATV, with 15 hours riding time on it, and when I ride it for about 20 minutes after it warms, and then park and shut off the engine, about 3-5 minutes later and for the next hour on and off, I get this purging noise eminating form the machine, It almost sounds like a bleet from a small deer/sheep...like baaa, baaaa...Does anyone ever experience this?? thank you