The actual set-up is the same, but OMC made some changes to them in 91 anticipating the major changes that came in 92 and 93 and also to help improve the idle fouling problems these engines have. The jetting will be different, but the actual set-up is the same. Also I believe in 91 is when they changed the lower units over to the fat prop shaft, but the actual parts set-ups and torque specs will all be the same for 90 and 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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