You sure that you didn't spin the hub on your prop? Also, based on rpm's it sounds like the engine is firing on all pistons, however how do you know its firing on all pistons?
Check to make sure your motor is properly vertically set to teh water when up to speed, if the motor is leaning forward of back you may never get on plane, even with a 50hp.
HOI Crappie Club
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Quick, someone teach me how to fish so I can win this tournament!!!