Difficult to find much info on Net about this bike.
Engine is same or v.similar to another Jap import - the FZR250 but without the EXUP
Useful Specs can be found on:
http://my-x15.net/FZR_INFO.html
or
http://my-x15.net/fzr250/FZR250%20specs.pdf
and owner manual at:
https://www.yamaha-motor.com.au (look under SUPPORT, and then OWNERS MANUALS)
or try
http://www.yamahaownershandbook.com.au/?r=0
Unfortunately not been able to track down a service manual - so if you find one in English.... please let me know.
Hope this helps you a little.
Tom