... have experienced significant mechanical issues with a new c9i. the bike is entirely smooth on the right side, but there is uneven on the left side downstroke. problem persisted after a number of service calls, and mfg apparently says this is "normal".
would not advise purchase of this model unless you try before you buy and the problem either does not exist or does not bother you.
tried their newer model, and one of the two i tried had the same issue. ...
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