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Yeah I never even come close to even opening the secondary butterflu on my crx.. been debating disabling it totally.
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Well I think that the secondary is there to keep the mixture correct as the engine air flow increases (among other reasons). The mixture might move rich or lean (i don't know) if the airflow thru the primary becomes very fast. The carb is an analog computer after all, I am amazed they work at all. If you disable part of the "equation solver" you might get an unwanted result.