I had an ORCA 6.5 do this, it ran very hot plus felt like the brakes were full on, I eventually traced it to one of the screws for the timing cover just touching the end of one of the windings where it solders to the board. If you take the end of the motor off you should be able to take just take 0.5mm of either the screws or the end of the winding with a dremmel.
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Speed Matters
Friday Night Buggy Racing nr. Milton Keynes - TCRCMC
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