Question about 2003 Yamaha YZ 125

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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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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.

Posted on May 28, 2009

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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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03 yamaha yz 125 there is a knocking noise from the transmission after rebuild of engine.


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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.

Jun 04, 2009 | 2003 Yamaha YZ 125

1 Answer

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

May 28, 2009 | 2003 Yamaha YZ 125

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2003 yz 125 stalling


sounds like the clutch is grabbing rip it apart and take a look

May 27, 2009 | 2003 Yamaha YZ 125

1 Answer

What oil for yz 125?


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

May 01, 2009 | 2003 Yamaha YZ 125

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