Try another tach. That engine NEEDS to reach 5600 rpms wot for it to perform properly. the 88 large bore is a bit more forgiving than the earlier small bore engine, but they're all sensitive to propping. I know my 86 with just a 2 inch pitch change in props could go from topping out at 5900 tpm's and 53 mph, to 5100 rpms and 40 mph on the bowrider i had it on. Propping is key for a big v4 looper to run properly.
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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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