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This is the Stock replacement EZ Start Motor the the Traxxas EZ Start System.
This motor is what turns the engine over in order to start it.
Positive end is identified
Product Item #: 4578
One Plastic Main Gear
Installation into EZ Start System.
Length without shaft: 38.2mm (1.51")
Length with shaft: 62.5mm (2.46")
Motor can diameter: 27.5mm (1.09")
Number of teeth on pinion: 8
Number of teeth on main gear: 38
The pinion gear is pressed on and cannot be removed.
BOX DIMENSIONS: 3.13" W. X 1.25" H. X 5.00" L.
BOX WEIGHT: .17 LBS.