I own a 2000 wr, It quit running after I last rode it, I now need to light candles to start it. If it does start it back fires thru the exhaust,will not idle and will only stay running if the enrichment knob is pulled out. I have adj the valves to spec, changed the plug, totally cleaned the carb,the filter,made sure it has fuel,went thru the ignition..resistance check. I changed the coil out with a buddies also his CDI unit! I have done everything I can think of. If any one has any suggestions please please help!