There is one more online store other than my store that sells parts for Yamaha underbone bikes. Some of the parts are quite rare and not available at my store.
Category: parts
Racing Bee is one of the well known brand for racers here in Malaysia.
SP599 Racing Boy Sports Rim Front (Black)
SP599 Racing Boy Sports Rim Front (White)
Racing Bee Racing Booster for Yamaha 135LC
FCCi Racing Stroker Kit for Yamaha 125Z
Yamaha DT125 Connecting Rod Kit Yamaha 125Z have connecting rod length 110mm, this one have 100mm length. You can use this conrod to your Y125Z if you want to use a higher deck height piston.
Faito 15T-37T 415 Racing Roller Chain for Yamaha RX-Z Item is for sale here: http://motomalaya.net/store/index.php?act=viewProd&productId=45