12-11-2015, 01:34 PM
I-4's by nature do not have perfect primary or secondary balance so their is some vibration which manifests itselt ar higher rpms. For all intents and purposes though it is so minor that it could hardly be considered a problem. Like Rboe says squeeze the tanks with your knees, or really clamp down on the handgrips and you may feel some of it, but you really have to look for it. I never notice it.