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12.21.2006, 10:08 PM
You basically just answered you own question...One has a built in heatsink and one doesn't...The black one has a screwed on endbell instead of a press on one like the purple one. There basically the same thing....Get the C version. The standard has the pressed on endbell that can possible pop off and ruin the motor (thats why the RC-M heatsink has a bar across the back).
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