Centrifugal motor AK16 with adjustable speed
An engine of AK 16 has the problem that it runs irregularly and has dropouts. One cause may be the contacts in the lower part of the motor, which are worn down by the operation. Most of these contacts have partially burned down, so you have to see if they are still to save or spare parts are needed. Spare parts are unlikely to be available. There can of course be other causes that are not discussed here
For testing, the engine must be disassembled in the lower part. The following tools are required for this: various small slotted screwdrivers of the highest quality, small pointed flat-nose pliers, sufficient light, magnifying glass, larger work surface, Cleaning fluid, eg isopropanol (alcohol),multi meter, if possible, laboratory power supply with display of power consumption camera lubricant.
Note: I disassembled an AK16 motor following the above instructions and managed to get it back together and running and I can honestly say the instructions are great, but it is a complete bastard of a job! I should have just bought another motor online... But if you are desperate, you have come to the right resource for the job. Good luck you poor bugger....(Editor)