by GTO Geoff » Mon Feb 22, 2021 8:55 am
The 19XX series are AVS, Air Valve Secondary. Like a QJ/TQ, has adj AV. Better option than the 14XX carbs which are AFB & have no easy way to adjust sec rate, although they usually work very well. The latest AVS has annular pri boosters, mate has used them, & reckons superb performance.