Yamaha Yz 450 F Manual
The air/fuel mixture will vary depending on atmospheric conditions. Therefore, it is necessary to take into consideration the air pressure, ambient temperature, humidity, etc., when adjusting the carburetor. Lexus 2018 gx470 technology quick guide. Perform a test run to check for proper engine performance (e.g., throttle response) and spark plug(-s) discoloration or fouling. Use these readings to determine the best possible carburetor setting.
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2007 Yamaha Yz450f Manual
Lower atmospheric pressure (at a high altitude) reduces the density of the air. The FLATCR carburetor has a primary main jet. This type of main jet is perfect for racing machines since it supplies an even flow of fuel, even at full load. Use the main jet and the jet needle to set the carburetor. The FLATCR carburetor is manufactured with a pilot screw. The pilot screw adjustment ranges from fully closed throttle to 1/4 open throttle.
ADJUSTING THE PILOT SCREW. The richness of the air-fuel mixture with the throttle fully closed to 1/4 open can be set by turning the pilot screw '1'.
Yamaha Yz450f Manual 2003
Turning in the pilot screw will make the mixture lean at low speeds, and turning it out will enrich it.