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Not sure Phil. I have a 150cc that I don't ride much anymore, but when I did and also
when it was nearly new, it had a miss and would not get up long hills good. I changed the plug to the iridium plug, replaced the CDI with a new High Performance model, but what helped the most was I removed the old vacuum fuel pump and replaced with a new electric low pressure pump with fuel pressure regulator. Also upgraded the fuel filter. Now itwill indicate near 60 mph on the speed. Don't know for sure, but I guess all the changes helped some, but together sure fixed the problem.
Tom
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