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Metal Grinding Noise coming from YZ250 motor

After I rev my bike, i hear a grinding noise coming from the top of my motor. It's a YZ 250, and the rings haven't been changed for over 20 hours. Could it have something to do with that? Need help soon.

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If its coming from the top end its definitely the ring/piston stop riding it if you keep riding it, it will mess up way more then top end if you cant do it your self take it to a shop asap

Posted on Feb 20, 2013

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Posted on Jan 02, 2017

dmsr63
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SOURCE: i have a 03 yz 250, and heres what going on with

Sounds like it needs to be split.
You could have a bent shift fork, or worn shift drum. This is not a "simple" job.
I've also seen where gears mesh chewed up or rounded off.
Get it opened up!

Posted on Nov 04, 2009

Testimonial: "thanks dude, ill see what it is "

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SOURCE: 2003 RM 250 THE BIKE HAD 15-20 HOURS ON IT FROM

Are you locating the rings on the locating pins?? Have you "gapped" the rings??
When you say locked up I assume you mean seized??

Posted on Mar 05, 2010

  • 2309 Answers

SOURCE: I hear a grinding noise

could be the front sprocket or the chain is stretched and not seating properly, replacement of both sprockets and chain will be required

Posted on Jul 28, 2010

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I have a 03 yz 250, and heres what going on with it. from neutral to second gear i let off the clutch and it makes a grinding sound, i was able to ride the bike back to HQ (my truck) and the rest of the...


Sounds like it needs to be split.
You could have a bent shift fork, or worn shift drum. This is not a "simple" job.
I've also seen where gears mesh chewed up or rounded off.
Get it opened up!

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