Hmmm. Pleanty of options here.
Here is an outline of somthing I set up for a performance seminar. This will give a guideline of things you can do.
Logical
performance plan
I) Tune
what’s there
1.
Jetting and me, how hard is it?
This allows you to get the most from Your combination.
II)
Let it breathe
1.
Air filters (you have done this)
2.
Exhaust (you have done this)
3.
Aftermarket
carbs (the next step?)
4.
Cams/head work (the next way to improve things)
III)
Ignition upgrades
1.
Single fire vs Dual fire
2.
Dual Plugs (not reqired for an Evo sporty)
IV)
there is no replacement for displacement
Hot set up kits