I was riding this past Saturday and again last night on a MX track and have noticed that my silencer has gotten a lot louder and I have lost some of the "hit" in the midrange. The bike is very quick to rev now. After the ride last night I noticed the silencer had some kind of rattle in it. Not anything loose, just very tinny. Is it broke??, does it just need repacking?? The manual says to check and replace if neccessary. What does that mean?? Help, going to get kicked off the track soon.... ------------------ 99 YZ400 Stock!!