worthyking Posted January 11, 2013 Share Posted January 11, 2013 Hey guys, I have an 03 YZ450F that I just recently bought. After riding a couple weekends I noticed a loud engine noise. To me it sounds like valves knocking. Reading the forums I have found other threads that say it's normal for these bikes, but I just want to be sure before I do anything rash. So...I took a video clip of the bike idling and wanted to see if you guys could take a listen and tell me if i need to worry. Here it is: Link to comment Share on other sites More sharing options...
Sacha Posted January 12, 2013 Share Posted January 12, 2013 Sorry I can't really tell you whether the bike sounds "normal". Can't really say I've ever been around that model (that I know of). I will say that you should pop into the new member section and introduce yourself. You'll likely get better response from the (knowledgeable) YOC folks. aboard! Link to comment Share on other sites More sharing options...
wild foamy Posted January 12, 2013 Share Posted January 12, 2013 Is it firing on all cylinders? Link to comment Share on other sites More sharing options...
Ryan09 Posted January 12, 2013 Share Posted January 12, 2013 Does sound like valves just tapping to me, no harm in getting them checked out anyway. Doesnt sound like a bottom end thats for sure so thats one good thing! Nice bike by the way. Link to comment Share on other sites More sharing options...
dt502001 Posted January 12, 2013 Share Posted January 12, 2013 Is it firing on all cylinders? Yo foams it's a 1 lung It sounds like everyother 450/250 wrf ,keep a eye on the valves or you'll be replacing the head Link to comment Share on other sites More sharing options...
Recommended Posts