These chonda is based from mid-90s JDM CA250T (twin carb) http://www.impex-jp.com/catalogs/mot.../16kr3fj2.html which more hp than EU/NA version "in theory"...
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Performance camshaft NEVER heard from various chinese forum...
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Squeeze more via big bore http://www.mychinamoto.com/forums/showthread.php?8113