Got a 2010 Voyager with 25K on it. Most KM done on a dyno machine as my bike was a tester for emission for the government. My problem is that the handle bar vibrates when driving. Had tire pressure adjusted, steering bearing inspected, front wheel balanced, changed front tire. Mechanic says good to go. But i still feel the vibration after a road test. He says it's normal and I should buy new anti-vibration grips. Any advice...?