Old Yamaha spareparts RS100?

Hello,

This is my first post, so hopeful for any information.

Planned a 4 day trip to bangkok with a friend,will be staying at Chinatown area.

My friend is looking for old Yamaha spareparts, Rs100?and RX King?

So far, based on google and browsing through the forum the place that we plan to visit:

1.woorachak?how big is the area for like motorcycle accesories and spareparts?

2.Poonsub?poonsap? suggestion how to get there, taxi/grab/uber and how much would it cost since looking at the map it is quite out of town?do we need thai speaking guide?

3. Red Barr

Recommendation please, any other place or warehouse or old junkyard to get the spareparts?

thanks in advance...