Excessive Vibration at Idle

[hondamoweruser1]

My Honda HRB215K3HX lawn mower has developed very excessive vibration as it idles but it smooths out to normal when I engage the blades. Any suggestions resolve this issue?

 

[ILENGINE]

If it has a blade clutch/brake I suspect that a bearing in the clutch is going bad. When you engage the blades that bearing is now turning with the flywheel therefore not spinning.