'99 EX questions

[Mad*Ex*Rider]

i resently bought a '99 400ex, lots of mods, no big bore, and i am wondering:
a) what octane of fuel should i be using

b) what type of tires (gravel roads and fairly muddy trails)

c) what type of oil is neccesary (i have been told to only use JASA approved oil which costs and arm a leg and a first born.

*all replies appreciated.*

[Robin Hood]

Well if the piston isnt high compression or there isnt a bore kit, you ca run regular pump gas.

And ITP Holeshots should be good tires for you.

[insaneracin2003]

i use Castrol semi synthetic 5w30,93 octane,and ITP holeshots would be a good tire,i would get the HD holeshots