You might want to make sure that the battery is fully charged, and make sure that the esc is programmed accordingly to the radio or just reset it.......you might also want to check the settings on the radio as well.
And another thing that you might want to check is binding, make sure that the pinion and gear mesh is not tight, that can cause a strain on the motor, and have you tried another battery pack.
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Xray M18
MRS4-1
540 MRS4
Spektrumized
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