Originally Posted by Adv Grifter
Early LC4 640's had issues. By around 2001 they got better. All have the WORST vibration of any bike I've ever ridden. Good performing bike but can have Gremlins.
This is putting it mildly. After owning and servicing 3 of them, I will never again own a bike that has "LC4" on its cases. IMO - The RFS engines are a better gamble for longevity than any LC4. JMO.