The bike is a 1992 KX500 rear shock rebuilt, front forks stock unknown condition of fluid at this point, forks level with top of triple tree, stock front knobbie tire, 110/19 10 paddle Skat Trak Intimidator rear tire, PC 2 pipe, re jetted carb, motor stock bore. Last Friday the 5th was my first ride on sand, I'll never ride another quad again! The bike gets a wobble so bad it almost throws me off I cant tell if it starts in the front or rear of the bike, I'm looking for any advice on bike set up or diagnosing what the heck is wrong with my set up. The rear tire has ribs down the center of it as tall as the paddles, i"m wondering if they are causing it to hydro plane on the sand? I switched bikes with my buddy and rode his CR500, his bike is stock with an 18" rear wheel and 12 paddle whiched tracked perfectly, I watched him on my KX it was everywhere except straight! Advice and opinions appreciated.