I have notived that the chain has taken bits from the alu rear frame (yamaha 06WR450FV part nr: 5TJ-21190-80-00) which holds up the seat etc I assume the chain has strectched slightly from new (the bike is brand new only 200km) and the slack is now too long. Is it normal for the chain to stretch or was it just the slight loosening of the rear wheel assembly?? My concern now is the alu rear frame. I will reduce the slack in the chain as per the bike specs in the manual, but I would still like to get some protection fro any further damage in future. Does anybody make some protection kits like a guide or bolt on pad or does one need to design something one self and stick (with 2 componet plastic steel) or cable rap it on? Thanks for the input folks.