CTC Yamaha TYZ250 Stainless Steel output shaft collar and rotary shaft seal kit now available.
These replace Yamaha part numbers:
90387-204Y5 (Collar - £173.86 from Yamaha) & 93102-06042 (rotary shaft seal - discontinued part).
These replacement parts come as a kit for £45 plus shipping, worldwide shipping is also available for this kit.