42 -- Handlebar vibrates or oscillates
Tires worn or out of balance. Either condition, particularly in the front tire, will promote shaking of the fork assembly and thus the handlebars. A sudden onset of shaking can result if a balance weight is displaced during use.
Tires badly positioned on the wheel rims. A moulded line on each wall of a tire is provided to allow visual verification that the tire is correctly positioned on the rim. A check can be made by rotating the tire; any misalignment will be immediately obvious.
Wheel rims warped or damaged. Inspect the wheels for run out as described in Maintenance - Major Service - Check the wheels and wheel bearings.
Swinging arm bearings worn. Renew the bearings.
Wheel bearings worn. Renew the bearings.
Steering head bearings incorrectly adjusted. Vibration is more likely to result from bearings which are too loose rather than too tight. Re-adjust the bearings.
Loose fork component fasteners. Loose nuts and bolts holding the fork legs, wheel spindle, mudguards or steering stem can promote shaking at the handlebars. Fasteners on running gear such as the forks and suspension should be check tightened occasionally to prevent dangerous looseness of components occurring. Engine mounting bolts loose. Tighten all fasteners.
© April 2015