There is no speed adjust, but 1st you must know the source of the slow down. Remove the belt from the motor pulley and run it, if it goes fast try turning the hand wheel if it is stiff the machine needs clean and oil. If it turns freely you motor may be dirty or just slow. If dirty, sometimes you can without the blet attached run it at full speed for 10 to 15 minutes. It should get faster as you run it. If not motor is weak or slow needs replace. Just replacement motor as genuine probably no longer available.
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