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It needs to be "re-jetted", meaning that you change the jets until you come up with the right mixture.

An exhaust gas analyzer is extremely helpful in this task.

# Run the engine up to operating temperature then drive around while watching the exhaust gas analyzer readings. # If the exhaust gas readings show that the engine is running rich, change to smaller jets. # If the exhaust gas readings show that the engine is running lean, change to larger jets. # If the exhaust gas readings show that you're running about right, don't worry, you can probably run it some more and end up with another reading. # If you're not completely happy with the readings, go back to step 1, otherwise, you're done.

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Q: How do you adjust carburetor for high altitude?
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