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Well ----The cowling indicates a motor sold as a commercial model.------The parts are the same as any other 70 HP model between 1989 to 1995 models.----Take it apart.------My guess is the middle cylinder is the bad one.-------Looks like the tell tale hose was never moved to top of block as per a service bulletin in 1994.-----Post picture of the spline at the top of the driveshaft.