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Motor rev very high when started

i have a 94 mercury 60 hp out

i have a 94 mercury 60 hp outboard we went out to the lake just a week ago and stay out most of the day started the motor to come in i thought it was going to take on its. cant figure why it rev high could blow the motor cant figure the problem can any body help i have changed plugs but it still does it
 
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