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Mechanical timing is most likely off. Set it to TDC and check the cam alignment with some of the pics of TDC on here. I just had to deal with this BS on a friends SR that we got from rndfactory. Felt fine down low with 0 power up top. Thought since it was a fresh motorset from japan that the mechanical timing had to be fine so we checked everything else like you did. Finally checked the cam timing and it was off.
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