Re: what is max RPM for 150GT
The factory recommended 4500-5500 as the "normal" operating range. That engine will still make good hp up to 5700-5800, so bursts to that rpm should not be a problem. When propping for best overall performance, you should try to hit the upper end of the "normal" operating range: 5500-5800 rpm. Running max rpm's at 4500 is considered lugging the engine and that is not good in the long term. It will result in poor performance and poor fuel economy.
