The following works quite well on my 96 KDX: B8ES, Belray 50:1 with Sunoco 94 octane, 152 main, 45 pilot, center clip on stock needle, 1 1/4 out on air screw, Pro Circuit plat. pipe, P.C. Spark Arrester, 12/47 Talon sprockets, Regina Gold O-Ring, M78 Bridgestone. The only reason I change the plug is out of guilt from leaving it in so long. Never foul plugs, even on the slowest, sandiest trails.
As per Brush, run the full qt. of oil . It really quiets down the Cent. advance .