REPLACEMENT 2 CAPACITORS FOR THE SPEED CONTROL BOARD ON THE 900 AND NOVA 900 PLUS TRIAC  IF YOUR MACHINE HAS CRACKLED OR SMOKED WITH A PUNGENT SMELL IT IS MOST LIKELY THESE 2 CAPACITORS HAVE BURNT OUT ON THE SPEED CONTROL BOARD IN THE BOTTOM OF THE MACHINE THESE WILL BE FOUND ON THE OTHER SIDE OF THE BOARD AND WILL HAVE MOST LIKELY SPLIT WITH A STICKY BROWN OIL LEAKING FROM THE CAPACITOR. SOMETIMES THE TRIAC ALSO FAILS AND SO THIS IS ALSO PROVIDED IN THE KIT. 
This listing is NOT for a replacement board just the components. A competent person is required to carry out this repair. We take no responsibility for any damage you may cause to your machine due to improper installation.