Hello Allfreed,
You can compare the parts catalog of the 2015 Yamaha YZF-R25 with the parts catalog of the 2015 Yamaha YZF-R3. With that information you can find all the parts you need to transform/upgrade the 250cc engine to a 321cc engine.
You can download the parts catalogs here:
-Yamaha YZF-R25 Parts Catalog (English)
-Yamaha YZF-R3 Parts Catalog (English/Thai)
Wow, this is really helpful information – thanks.
Can we order the needed Yamaha parts from any Thai Yamaha dealer or are there some restrictions?
Hi.. We are from Indonesia. In Indonesia we only have Yamaha R25. The question is, do you have complete parts to upgrade our R25 or MT25 250cc to become 320cc? Waiting for the good news.