I just bought a 2004 cr250 with 7 total hours on the bike for $1700. I noticed the bike makes a knocking noise that seems to be coming from the engine. I took it to a friend who knows a lot about dirt bikes and he told me that he believes it is just the power valves rattling around and it should be fine. What i want to know is if that sound is just a common thing for the 2004 cr250? Is there anyone on here that ownes one and it does the same thing?
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