poss yuor 3.5 is a sintered rotor and your over geared hence the shut down.
changing a 6.5 to a 3.5 rotor will not alter the performance unless it being changed from a no sintered to a sintered, the windings are in the can
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MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD
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