My WR 450F 2003 8oooKms rattles when hot and under load is this normal?
from your short description of the problem to me it sounds like your bike is pinging (detonating)(http://en.wikipedia.org/wiki/Engine_knocking)
Run a better grade fuel
Maybe you got crap fuel the last time you filled the can or tank
My '09 sounds like a coffee can full of rocks when I'm a gear high and climbing on the power...it's normal. As said above, it could be your fuel if your running lower test. I run the highest I can find here...94 octane. It's pricy but worth it.
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