Use high-quality 2-stroke air-cooled engine oil (JASO FD or ISO-L-EGD grade preferred).
The manual states this is caused by an incompletely inserted microphone jack. Insert the mic plug fully (two clicks). Also, avoid recording near fluorescent lights. denzel dt-52 manual
Wash in warm soapy water, dry completely, squeeze with light oil. Every 10 operating hours Clean carbon deposits, check gap (0.6 - 0.7 mm). Every 25 operating hours Gearbox Use high-quality 2-stroke air-cooled engine oil (JASO FD