2003 Yamaha YZ 125 Logo

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Posted on May 28, 2009
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Yz 125 ratteling sound in clutch or trans.

Have noise coming from clutch or trans. when ideling or riding slow. Any ideas how to tell before taking it apart.

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  • Posted on May 28, 2009
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Joined: May 03, 2009
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It could be a lot of things but most likely is the clutch main basket.The sprocket attached to it uses springs to absorb the torque from the crankshaft.Those springs work against aluminum hubs witch can wear off very easy.

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Yz 426 while riding it i went to park it thought it was out of gear and let out on the clutch and it died went to start it back up and the kick start seemed to b stuck so i rocked it back and forth fi

How does the compression feel now that you have it cranking over again. Without the decompression lever pulled in it should be next to impossible to kick it over. also, is there any noise coming from the engine (knocking, etc.) when you got it to start again.
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Got ratle in engine loud noise

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On my yz 125 my kick start is jammed

Were you riding it when it jammed because that could mean the that something is sized inside the motor, like the crank or the pistion
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2003 yz 125 clutch

This sounds like dirt and grit in the oil is causing the clutch to grab. Change the gearbox oil. Ride the bike for a couple of hours using the clutch often. Now drain the oil again and put in fresh oil. This will flush out the dirt and grit. Use 10w40 motor oil. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell. Do not use synthetics or oils with "special" additives.

Other possible causes are > a need to adjust the clutch lever for 1/4" free play at end of the lever > warped clutch plates or friction plates > Clutch has been worked on and assembled wrong > low oil level in the gearbox > frozen clutch hub bearing > Incorrect clutch cable being used.

Please post a comment after the double oil change. The 2x oil change is a cheap way to eliminate a possible cause and hey, it isn't gonna hurt anything. If you still have the problem I can help with a clutch rebuild.
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Noise cooming from clutch or trans.? at idle and riding slow.. yz

a possible worn clutch lining or the clutch assembly is loose. the service manual will walk you through getting it tight with a torque wrench. best if you don't ride it for the mean time.

good luck
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2003 yz 125 stalling

sounds like the clutch is grabbing rip it apart and take a look
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What oil for yz 125?

I would use maxima mt 75w gear oil in all 2-stroke trans.
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