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Crf150r Sounds High Pitched

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Some day it sounds like a good, low pitch, other days it sounds like a high pitch. Does this have to do with running lean or running rich?

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Some day it sounds like a good, low pitch, other days it sounds like a high pitch. Does this have to do with running lean or running rich?

 

I don't think pitch is the word to describe whatever it is you are talking about. Pitch refers to frequency, which correlates to rpm. Are you talking about clean versus ragged sounding? If so, yes, that could definitely have to do with jetting, especially if the temperature and humidity have been fluctuating as much in Arizona as they have been elsewhere i the country, or if you have been riding a significantly different elevations on your rides.

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