I purchased a new Redmax EB7000, after running it for the day it felt like the engine was not running as fast as the EB6200. I used a tachometer on the 6200 it was around 7700-7800 RPM. The EB7000 was 7500 RPM. The manual for both 6200 & 7000 says 7500RPM is max. Whats going on, why is my 7000 less than the 6200. Could someone please measure RPM on 6200 & 7000 Redmax. I used a digital tachometer. The dealer says its 7500 its ok, but my older 6200 have higher RPM. 200-300 RPM makes a HUGE difference.