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You can also use a cheap or used narrow band sensor and a volt meter to get pretty close. With the narrow band sensor your mixture needs to be close enough to get it to occaisionally vary between rich and lean of stoich with atmospheric conditions, then you know you are close.
Mount it as close to the head as reasonable so it can stay hot and read accurately.
Nearly all carb'd bikes could benefit from more accurate mixture tuning.
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Good design is simple. Getting there isn't.
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