This is a replacement Dynamite 3650 6-Pole Marine Motor. 

Features:

• 6-Pole Design
• 2000kV
• Water-Cooled
• 5.5mm Motor Bullets

Specifications:

• Type: Brushless Inrunner Marine
• Bearings or Bushings: Bearings
• # of Turns/Windings: 1.5-D
• Timing: 7.5 degree Maximum
• Voltage: 7.4-22.2V
• RPM/Volt (Kv): 2000Kv
• Cells: 2-6S LiPo
• Speed Control: 120A
• Weight: 10.4 oz (294.8g)
• Overall Diameter: 1.42 in (36mm)
• Shaft Diameter: 0.20 in (5mm)
• Shaft Length: 0.61 in (15.5mm)
• Overall Length: 2.20 in (56mm)