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New top end?

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So i got a 03 yz 250 a few months ago and when I went to go start it today I noticed a rattling/knocking noise from about a little bit in front of the seat but under the plastics. The bike has a wiseco piston in it but im wondering if that noise is normal or does it need a top end or something like that. Thanks for your help!

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Honestly if you bought a used bike I'd pull the cylinder and replace the ring $30 regardless. It only takes like an 1 hr. and is great insurance to prevent any further problems. Plus you could look around in there for play in the rod.

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Answers really simple actually, unless the guy gives me reciepts on the top end that was done the day before I always replace the piston and inspect the cylinder before I even kick the bike. You never know how many hours are on a piston and cylinder unless you open the bike and even then thats not a guarentee that the piston is not past its service interval. Also as redneck stated, check the rod for up and down play.

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