DON'T DO IT! The 2.25:1 gears don't hold up to the added torque. V4's eat the 2.25: gear sets up where the 1.86:1 gears in a V6 live just fine. You would have to go up about 3-6 inches of pitch, and you would be rolling the dice on wether it chews up the gears or not. And I'm pretty sure teh driveshafts are different lengths on the two. The 93+ V6's used a shorter shaft I believe, but I cannot remember if the V4's made the switch or not.
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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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