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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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6ya6ya
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Posted on Jan 02, 2017

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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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1 Answer

Bike was running great on saturday. Went to the races bike started right up when the gate dropped bike won't rev out all the way. Didn't have this problem yesterday. When we got home i cleaned the car


Hi, Anonymous and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
YZ250 electrical issue won rev up
YZ250 bad reed Yamaha 2 Stroke
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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Check the compression. It should have at least 100 psi,..if not,then its time to rebuild the top end..IE piston,rings,bore cylinder. If compression checks out,i would start with the power valve. Two stroke dirtbikes power valves are notorius for gumming up and sticking,causing them to not rev correctly.

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Hello jerry...does this "ticking" sound like it is coming from the top of the engine...the cylinder head area? You can take a short piece of hose, like a heater hose or even a garden hose, place one end to your ear and the other on the engine, move it around and u can pinpoint the area it is coming from better. I would say that your valves are probably making the ticking noise and need to be adjusted. Either that or an exhaust leak around the pipe and cylinder head, If you haven't adjusted the valves they probably are due for it. I will go ahead give you the specs for them.
Valves are to be adjusted and set on a COLD engine.

Intake Valve .001 to .003

Exhaust Valve .003 to .005

As you can see this is not much of a lash...so normal wear will cause them to start making noise once they get out of adjustment. I hope this helps & good luck with your bike.

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1 Answer

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sounds like your battery is flat!!..try charageing it up...see if that works...& just check for loose wires on battery & starter motor

Jan 28, 2010 | 2003 Yamaha YZ 250 F

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