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Since you are replacing the old motor I am guessing that the engine has some miles on it. If this is so I'd bet you have some slop in the gears. <br /> <br />When you run the engine forward it is lifting the gear in the gear box up and binding just a little. When you run the engine in reverse it is forcing the gear down where it belongs and the engine runs correctly. <br /> <br />Now with that said I have no idea how you would fix this short of replacing the gear boxes.
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