Is there anyone who has been using the crf450r timing chain on thier 400ex had any problems.
I have a guy building my 400ex and he does not want to use the 450 chain cause he thinks
it wiggles on the sprockets to much. He thinks it is a weak spot. Any info would be great.

 

well the heavy duty timing chains for the 400ex are the same way. yes, my friend and i both have one and they seem to work great.