250-500cc Wr250 Or Wr300?

So I bought a 95 wr250 a few yrs ago. It's just sat in shed since. When I pulled it out and the cdi was shot and the stator was all corroded. So I found a new cdi and had the stator rebuilt am trying to tune it as it wasn't right. It has a Gilardino cylinder with 297A stamped on the side. Does this indicate that it's a 300 kit?
It also has a Mikuni Tmx38 flatslider carby, does anyone have a jetting size list for this carby or could anyone recommend what size jets I should be using. Top end was fine bottom end was boggy and kept fowling plugs. Now has 50/1 fuel mix BR9EIX Iridium spark plug.
This is my 1st 2t I've ever owned and am still learning thanks in advance

Your bike is 250, I would check the reeds.

As rancher said. Check the reeds (id just replace them) .....mine looked fine but when i replaced them it cured the overly rich problem. My 94 250 is still running the original mikuni flat slide tm/tmx carb. Runs great idles great. Main jet 440, pilot jet 40, needle clip 2nd from top. Set gloat height while youre in there. I believe its 18-20mm. Good luck

great bike