To race in the stock class, you are required to have up to 1500mah sub c batteries with a nominal voltage of each cell being no higher than 1.2v. I recommend that you get the side by side 1300 cells from Speedi Models in Auckland, or Frankton Models in Hamilton. These cells mean that you can easily discharge them after each race day, in a discharger which will discharge each individual cell, making them last much longer.
You are also required to have a "stock" motor, which is often called a silver can motor. The part number for this is: #53689 Johnson RS540 motor. This motor is sold under the Tamiya brand name.
This motor will set you back $30 but if it is run in properly and not over geared, it will last several seasons.
Motor Cooling during the race, can be achieved via a heatsink with a fan, or a heatsink without a fan. Otherwise, take a look at my guide on building a thermal electric cooler here.
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