250-500cc wr250 jetting at 500ft

I am looking for recommendations. My bike is jetted really well at a 3500' elevation. It came that way when I bought it. I am racing this weekend at 500' in elkton, OR. Will a larger pilot jet, or turning the fuel screw in work? I don't want to blow up or have pinging.

Kind of hard to give you a recommendation without knowing your current settings. Plus how hot is it going to be? Provided your bike is running good now and the temps are going to be the same, I would start at one size larger main and raise your needle one clip. Unless your air screw is already only a half a turn open, you should be able to run the same pilot and turn your air screw in a half or one turn.

Hello! It seems like the 250 and 300 use almost identical jettings. What carb du you have and what´s in it now? Temp?

Johnny

What's in it now ? Did the 35 pilot and richer needle get put in the bike ?
I had a 30 pilot 400 main, 4.0 slide and the 61 needle in my bike before putting the JD kit in it, now I have the JD kit with a 390 main and the 4.0 slide

You're probably in bed by now, but I ride both sides of the mountain, and the jetting I use here works fine over there. Keep in mind that Millican Plateu, EFR and the like is more open that the Big K, and you won't have the sustained high rpm wide open throttle here. I think you'll be plenty safe at the Funky Chicken.