I have a problem with my 1998 yamaha blaster. Whenever you try to shift gears it makes a hard popping noise and barely goes in gear. It will go through all the gears but it's hard to get it in them. You can keep shifting up and it will stay in nuetral and finally go into a gear. It will slip out of gear a lot too. What is wrong? Is it the clutch plates, the shifting star or what?