15-02-19, 01:04 PM
The Fazer is fairly insensitive to the type of silencer fitted. Unless a mouse has built a nest in the exhaust I doubt the change is the cause of the problem.
What was the weather like when you tested it? The cold, misty mornings we’ve had lately are ideal for carb icing. If the heater passageways through the carbs have become blocked that can give symptoms similar to those you describe.