I have a Yamaha Kodiak that won’t move but a little in full throttle I do has u say an the primary closes on belt everything spins an new belt as well but when I put it in gear the primary doesn’t close wat is the problem I’m not seeing thanks for the help

 

When you have it in gear, does the front pulley spin when you rev up. If it doesn't or just moves very slowly, the centrifugal (wet) clutch is worn out. As written above, Yamaha want extortionate amounts for a complete new assembly, but as all makers use similar components and Honda do sell shoes separately (circa $50 a set), it could be worth comparing Honda shoes for a 300, 350 or 450 and, if they are the same, fit them.