My BF went to the dealer today with a really bad rattling noise in the engine. The noise mostly happens after a run of 30-40 mph, and then letting off the gas and engine braking starts. The BF only has 51 miles on it! It is my first ATV, so I've been lurking around on the ATV sites/forums and learning alot from you'all ! I enjoy reading the posts immensely!! If anybody has a guess as to what this problem could be,, chime in! Thanks in advance........BO

 

Check all your bolts! I found that all of my heatshield bolts were loose and eventually lost one on the trail which gave me a huge rattling noise as i decelerated. add some skinny lock washers underneath those bolts but make sure to check all other bolts because i found alot of loose screws and bolts on my machine just dont over-torque anything

 

after my first ride my brute was doing that it was the bolts on the heat shield, check them after its cooled off, check any othervisible nuts and bolts before you ride again.