Carb backfiring “Weber ICT34”

[Gabs]

How old were the carbs Paul out of interest, did you buy them new?

Hey Justin, there 2 years old so looking at some details cause could be fuel so I might start adding a additive to help but also add Viton needle jets and copper / brass floats in the next month or so. I did get a viton needle valve in the eurocarb
Service kit but that a 175 and advised keep standard 150 so not sure what difference it would make on running with larger needle.

 

[creationblue]

Still pretty new then! I am surprised tbh