Another OX66 Question, Idle Speed

My 2000 OX66 225 idles about 600rpm in neutral and about 400 in gear. Running 15 1/4x17 prop. What should it be, higher I am sure and is it an easy adjustment?

Carolina Skiff Doug
1980DLX Yamaha 90
Tournament 225 OX55 225

750 NEUTRAL
600 IN GEAR

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