As they are faster than the stock engine and appear to be a bit more reliable we'll have to wait and see. Upgrade a 6 volt four wheeler, two of which run 12 volts, and now you're comfortable in the grass. I also upgraded a 12 volt car with two of these and ran them on 24 volts with the Razor scooter controller and now the little car will go up to 165 pounds at 9mph. I would recommend so far.
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