noise

hey everybody! Well, I guess I should start off by saying that I am brand new to this forum and this is my first post. I wasn’t exactly Sure where I should’ve placed it but this look like a good a place as any and it has a lot of threads so I figured it might have the most potential to be seen...

so my buddy just got a 05 450r with no engine mods to my knowledge other than a stage 2 hot cam and a full sparks pipe. it’s been running pretty good until today he was riding it and it died all of a sudden and made a kind of metal on metal grinding noise. it will still start and run but keeps...