The Honda CD70 Euro2 carburetor is equipped with an air screw for adjusting the idle mixture. The optimal method for adjusting the carburetor's idle mixture involves delicately balancing the air-fuel mixture within the provided adjustment range.
Step 1: To adjust the idle speed to 1500 rpm, utilize the idle screw. Turn the screw clockwise to increase the engine RPM and counterclockwise to decrease it.
Step 2:
Begin by turning the idle air mixture screw left by 1 and a half turns to adjust it to the factory setting.
Next, starting from this position, gradually turn the screw a quarter turn to the right, pausing each time to check if the engine RPM decreases.
Once you observe a decrease in engine RPM, take note of this point.
Then, turn the adjustment screw to the left until the RPM begins to stumble or become irregular.
Finally, set the adjuster screw between these two points where the engine stumbles or the RPM starts to decrease.
For example :
At one turn, you'll notice the engine RPM starting to decrease. By two turns, the RPM begins to get irregular. At two and a half turns, that's the sweet spot where the idle mixture screw should be set.
Step 3: Following the adjustment of the air mixture screw, fine-tune the RPM using the idle RPM screw until it reaches 1500 RPM.
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