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good article on exhaust systems, jetting, etc.

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Found an article that was helpful for me as someone learning about exhausts, jetting, etc. Easy to understand info on how different factor play together. If is from the white brothers web site, so hope people don't think I am advertising for them. First page is advertising stuff, the next 6-7 are technical . Here is the link. http://www.whitebros.com/offman/YZ400.pdf

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