For the most part they are the same. The jetting and such changed from 90-91 as did the carbs, intake, and the recirc valve design. The basic design of the engine is all the same still, but OMC did make SEVERALi mprovements in 91.
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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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