You'll most likely need a jack plate or similiar to raise your transom up. A 20" transom is normally closer to 22" and a 25" will be 25-27" from what I have seen. A 20" shaft engine on a 25" transom would cavitate SEVERLY with a standard prop. So you most likely currently have a 20" transom. Many people cut the 25" down to a 20 because there engine is a 20". Just make sure that your cap is solid, I just replaced the aluminum cap on my HYDRA last week.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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