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Don't feel like quoting above posts, too lazy..lol
Yes shimming is a rudimentary form form of making your mixture richer. Adding an exhaust or pulling the snorkel will need shims. I believe it's 2-3 washers for an exhaust or removing the snorkel, otherwise your bike will be too lean. Of course I believe 2 works for most people, but each bike's factory mixture setting can vary a little. My friend's 250 runs a tad leaner than mine.
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