I've started playing around with the carburettors on a spare Ninja 250 to set it up for pod filters.

I've noticed that there is a cooling system circuit that flows through the carburettors from the LHS side just after the radiator and rejoins on the RHS just before it. I can't find any reference to this circuit on US (2008-2012 pre FI) or UK bikes (circuit doesn't appear in the FI service manual). It looks like a heating circuit for the carbs. I did find a reference to this being specific for Australian emissions standards on startup, to heat the fuel, but haven't seen any further fuller details of what time period it came in.

I guess other carburettor bikes in AU had to comply as well and would have had similar type circuits for emissions purposes, (I suppose it also helps with carburettor icing).

Anyway my question is: Is it really needed for track bikes? Predominately run at SMSP? Obviously I don't care about emissions, and I would have thought carb icing problems would be rare at SMSP other than in the dead of winter on foggy days.

So wondering if anyone else with a carburettor bike has some across this and has some opinions they could share?

I assume I can just completely remove the circuit from the carbs and plug both of the lines coming off the main cooling lines?