So, you moved the clip on the needle DOWN one, right ?
You should have if not.
Anyway Vcandito whats probably happening here is that you are hitting the rev limiter, it happens a lot on 230's, new owners write in that at high rpms, like when you're winding it out before shifting,the bike bogs/cuts out. the only way that's happening that's other than the rev limiter would be if you installed a main jet LEANER than stock....not in this case. You're hitting the rev limiter.
My buddies 230 he had before getting the 250X we did the Power up jets (45 pilot), snorkle removal,Powroll cam and BBR pipe just really ran super strong for a 230,and you even use the stock valve springs.
All really nice mods, but nothing made the bike a whole lot better for so little money than installing a 15 tooth counter shaft sprocket. DO this mod ! It's cheap, top speed is increased about 10 mph, first gear is no longer useless with second pretty sorry as it is now, NO climbing ability is lost, it's just a total winner of a mod.
Project CRF230 at
www.off-road.com by Rick Seiman is where we got the scoop on the CS sprocket, it's really very,very effective. It's even easier for the new rider to learn on, you won't be sorry.