WR450 rattles when hot

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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