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I have a 1999 16' dauntless with 90 hp 1999 2stroke. last time out the motor would increase revs but speed would not increase and churned up water into rear well. felt like prop was slipping although later on land when turned prop by hand seemed tro turn over engine. Do I need a new prop. don't know current size but assume original aluminum, or does the spline wear out and need new spline?? , whatever. any help would be appreciated.