You can gain much by re-jetting with a slip on. Unless you know what you are doing have a shop jet it; just put the slip on and get the right jet kit and let them get it right. Keep in mind with a nice jump in performance you will lose some fuel economy.
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2005 CRF 450r
1989 JS 550
2001 Zuma 50 (beer runner)
I miss the two-stroke! 
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