pull the gas line off of the carburetor and let it drain.
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dude
The type of carburetor on the 1999 Yamaha YZ 125 is Mikuni how ever the sub model is either VM TM or TMX
Here you are, http://cgi.ebay.com/ebaymotors/1984-YAMAHA-Riva-XC180ZL-Scooter-Carburetor-Assembly_W0QQcmdZViewItemQQ_trkparmsZ72Q3a543Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318QQ_trksidZp3286Q2ec0Q2em14QQhashZitem160298204815QQitemZ160298204815QQptZMotorcyclesQ5fPartsQ5fAccessories
under the gas tank
Taking it apart:-)
E BAY.COM
Mukini
With a screw driver