Mikuni MKA400 Universal JetRef : MK00065A / 1009917

MIKUNI MKA400 Jet (manufacturer part number: 4/042-400) — a carburetion part designed for precise fuel dosing in Mikuni carburetors. This jet is intended for motorcyclists and mechanics looking to replace a worn part or fine-tune their carb settings to achieve a smooth engine response.

Simple yet essential, the jet plays a central role in the air/fuel balance: an appropriate diameter helps avoid overly rich or lean carburetion, optimizing torque and throttle response when correctly chosen and installed.

• Usage: replacement or adjustment of carburetion on Mikuni carburetors.
• Advantage: restoration of fuel flow accuracy for more consistent operation.
• Target audience: motorcyclists, tuners, and repair shops.

Workshop tips: check the part number before installation and keep the other jets from the kit for reference. Carburetion adjustments should be made gradually (idle tests, throttle response, and full load) or entrusted to a specialist for optimal tuning on the road or dynamometer. The MKA400 is the discreet component that helps refine performance and consumption when paired with appropriate tuning.