Question about 2003 Yamaha YZ 125
The small hole under the water pump is the weep hole and is designed to start dripping water when your pump has a problem. You should remove the pump and find out what the problem is before it quits and leaves you stranded. Could be simply the seal, or the shaft may have become pitted.
With the brakes, I assume you have looked at the brake pads and they are good so bleeding is definitely the first option. If that does not fix it remove the calipers and check that the pistons move when you squeeze the lever and that you can easily push them back into the caliper (after you disconnect the brake line). Then rebuild them if required and reinstall.
Posted on Mar 24, 2009
Have you checked you hoses for the antifreeze leak?
you need to fill your radiator and clean up any antifreeze and start the bike and warm it up and look for where you antifreeze is coming from.
these bike didnt have ha problem with head gaskets but it is a possibility.
this model had o-rings on the head not a gasket
on your brakes first try to bleed the system. and then go from there.
Posted on Nov 17, 2008
front brake probably has air in it and are you sure the fluid is water from below your bike? I am in the middle of repairing a 2004 YZ125 and being my first time dis-assembling a 2 stroke motor I would have to say it has been very easy. I took out the gears and cleaned the housing and checked thickness with my mics and lubbed and re-installed into the housing. The clutch works better than it ever did and it took me about 5hrs total with tearing body, radiators, ect. off bike.
Posted on May 18, 2009
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Posted on Jan 02, 2017
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