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#2 engine runs fine and cranks over great. #1 engine will not crank over even with a new battery and swapped batteries. Contiues to crank very slow or not at all. Checked corrosion on wiring. Two weeks ago ran fine. had problem with the same engine in the pump housing. A bushing started to freeze up near the pump but we cleaned it out and changed the impellor. Still does not crank over hard and will not start. ??