I have an 04 crf450r I think the bottom end is blown how can I tell?
Take it apart and measure bearing play.
Really though a blown bottom end is pretty easy to tell. Shavings in oil filter, loud knocking, seized up, etc..
usually the small end on the rod goes first you need to measure the inside (with a small bore gauge) of it where the piston pin goes in, to check the crank its best to remove it to check it out
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