Air passes through those hoses, not fuel. Fuel only enters the carbs via the main pipe from the fuel tank.

There are small "jets" in the connectors, hence the "kit" connectors in the HRC jet kit. These are the so-called Air Jets.

I think this may be an area of concern to start with. You should at least get the stock hose connectors before you continue trying to solve any poor running issues.
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Andy.
NSR-WORLD.COM

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