I have a 00 YZ426f that refuses to start. Last time I rode the bike it worked fine, I loaded in the truck and went home..... Since then it won't start. Usually the kick start will travel completely to the foot peg, but now stops 2 or 3 inches higher as if something was binding the motor....inspected plug, has fire, carb is throwing gas like its supposed to... I took of head to inspect valves, valve function... Seems perfect. With head off kickstart travels right to the foot peg as normal.... Piston rings and crank operation seem flawless.... Upon reassembly, ensured timing is right(as per manual) but same thing, won't start, won't make an exhaust sound, kickstart will NOT travel full range of motion again, still stopping short 3 inches from foot peg..... PLEASE help! Any comments/thoughts are welcome.