Its definately preferable to have the right bar mount, but bar wieght is important for sure. When l put a 14" light picco bar on a 555 it almost felt like it had no b/c, but it wanted more chain. So l modded the nose sprocket to run standard 3/8. l don't run to many silly setup's like that anymore and try to get correct bar mounts to begin with. But these new age light bars are great, some are not so light. Nothing wrong with laminated bars either, often they can be the best option.