Rattle from engine as soon as you start engine
SOURCE: Engine oil
They take just under 1ltr of oil. you can check the level is correct by running the engine till its warm and pulling out the dipstick located near the head stock on the frame. If the level is low then add more oil, be careful not to overfill as the later model WR's expel excess oil into the air box, this can make a mess of your air filter.
SOURCE: What are the valve clearances of the engine of
Valve clearances are
in 0,12 mm
ex 0,15 mm
on cold engine
SOURCE: yamaha tw 125
The noise you hear is valve clatter. You should not adjust your timing chain. Instead get a manual and find the vlave clearances for that bike. (Ex. The exaughst valve may be .006" and the intake valve may be .004") Then you'll need a feeler gauge, and to do this you'll remove the valve covers and get the engine to TDC (Top Dead Center) This is where the piston is at the very top of it's stroke and both valves are shut. (compression stroke) You must then loosen the rocker arm nut to the point that you can insert the feeler gauge between the rocker arm and the top of the valve run the nut down tight to the feeler gauge and then pull gauge out and repeat on the other valve.
SOURCE: how do i decode yamaha yz 125 engin id number
You don't decode it. It is only a production run series number. Mororcycles are like cars in that respect. It is the frame number, AKA the "VIN number", is what carries all the information. Call a dealer with the frame number and he can tell you year, paint color, specific model and more. They may have a problem if the bike is too old. Yamaha changed to a newer code system a few years back.
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SOURCE: power valve position and installation for yz 125
The proper adjustment is achieved when the notch in the actuator lines up with the pin hole in the cylinder casting.
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