When you replaced the balncer, did the engine try to rotate? If not then it is most likely seized up. Pull the plugs out of it, put a ratchet on the crank bolt, and see if it will turn. If it doesn't turn relatively easily, you are seized and should spray some petrating oil or something down into the cylinders, and let it sit for a few days, and spray it again, then see if you can get it to move.
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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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