Okay so I got the jdm motor in 125 a little while ago, we filled her with fluids after the 2 bolts for the oil cooler delete kit came in. I drove her around the block to check for leaks etc, ring her back to the shop and it sounded like a deff miss, wasn't getting boost until 4k and it just felt wierd, drove it again and it didnt go away. Prior to this you could hear the lifter tick, but it was pretty loud, I could hear it in the car with the good popped over my exhaust. So we did a compression test and got 140,130,130ish and 50 on cylinder 4.. Currently were thinking stuck valve. Motor has warrenty on it but were gonna see what we can do... I'm so upset it just sucks. But I'm not giving up