Carburettor air screw adjust and idling screw adjust with pulse engine tachometer

【Fitment】:Fits most Keihin FCR & FCR-MX Carburetors,fits most common 4-stroke models (Reference fit models as following).fcr air fuel screw adjuster

Air Fuel Mixture Screw CNC Adjust Carb FCR Air Screw Compatible with KEIHIN Carburetor Four-Strokes FCR Carbs Motorcross Motorcycle(red)

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Pilot Screw Adjustment - Cyclepedia

Idle Mixture Adjustment Tool, 90 Degree End For Tight Spaces, EACH

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Dino 246 Restoration Blog: 2014

Carburettor air screw adjust and idling screw adjust with pulse

Dino 246 Restoration Blog: August 2014

Dino 246 Restoration Blog: August 2014

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Hero Honda mileage setting with tachometer carburettor setting