Hello Xt'rs

new here,

i am based in milan, italy and road race vintage stuff like CB500/4 and a 750/810 Gpz in the national series.

in order to get more (and cheaper) track time, bought a nice condition 1990 XT600E with 25K km that i am in the process of turning into a supermoto.
It is not meant to be a racer, just something to train with in a track i have near home (Castelleto di Branduzzo)

Pista

Not going to mess with the motor much, it's sweet running, so just a foam air filter and straight through exhaust.

TZR 17" with a 300mm disc wheels are on the way, gonna fit a GSXR caliper for braking in the front.

A few questions then:

15/45 is the stock gearing, I will surely want to shorten as this is a supermoto track only bike. does anybody have any experience with supermoto track gearing for an XT? Bike will not be used for any street riding, just SM track and a slow one at that.

suspension set up. I will lower and stiffen the front springs, any numbers as to a baseline ride height and spring rate? any ideas for a reasonable shock change that doesnt include a 1000$ ohlins?

any recommendations regarding jetting changes for a foam filter and open race exhaust? The bike has the usual stock double carb jobbie.

Will post pics when the bike starts take shape. right now its a plain XT600E....

Grazie mille in advance

TG