21-05-22, 10:38 AM
Had the same issue on my Serow Had the Carb apart and everything was fine. I check the diaphragm and found it was not very flexible. Luckily it takes the same diaphragm as the FZS600, swapped the diaphragm from a spare set of carbs I have and has been perfect since. . Only ever came across the issue in an old CB250K2 back in the 70s.