i'm sure you have already done this but have you adjusted the torque adjustment knob on it if its turned down it will act like its geting low air pressure. fyi bluepoint doesn't make tools they rebadge them your impact should be made by IR. if possible post a pic because i'm sure my description of the knob is a bit off and with a pic it will make it easier to show where it is
i believe that on yours it may be a separate oil location to make sure oil gets supplied to the internal bearings and bushings. since the adjustment knob didn't do anything to help i'm thinking that either like sonny said its got dirt inside first place to check is the screen that is in the air inlet (where the fitting threads in) or that it has a bad o-ring internally
Not sure about the side oil port, I would put some in the Inlet and try it. Might get a little messy, but it will cleanup and might just make it work better.
ok intake screen was a little dirty and there was some trash on the ball bearing that stops the air flow (i guess) at the inlet also, seems to spin faster, but not perfect yet, guess ill have to look farther into it
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