Have an '05 DRZ125 I recently got for my son. Had idle problems when I got it. Will only idle with the choke on. I searched old post and saw the culprit is usually a stopped up carb, specifically the pilot jet. I removed, disassembled and cleaned everything but it runs exactly the same. What do I do from here. I noticed the main jet size is 107.5 and there was some trash and flaky residue inside.