Pablito

Hello, I just received my Makita SP6000J track saw. When you start the motor, it makes a grinding kind of sound and vibrates, then smooths out when it reaches speed. Not a pleasant sound. From comments in other web sites, I am not the only one who noticed this. But some claim it's normal (a function of the soft start motor?) and some claim the saw must be defective. Would appreciate any thoughts from folks who know this tool.