There are many factors that effect this, but there is an RPM range you should be within, with a healthy running engine. If your RPM are below, or above this, it’s worth looking into it, to determine if you have a problem.
- 150HP models (Non-supercharged): 7350 +/-150 RPM (Soft rev limiter at 7550)
- 200, 250, and 300HP models (Supercharged): 7800 +/- 200 RPM (Soft rev limiter at 8050)
If you are not reaching these RPM ranges at WOT, and have dual engines, run them with engine synchronization turned off, to determine the true RPM max of each engine. Often an engine with an issue will bring down the RPM of the better-running engine with sync on, making troubleshooting difficult.
Low engine RPM can be caused by many factors, including poor gas quality or low octane, worn spark plugs, various sensor problems (check codes), engine relays that are failing, high altitude, or various other situations.
RPM’s too high is usually a result of worn jet-pump parts, so the impeller and wear-ring should be checked.
RPM troubleshooting is beyond the scope of an FAQ, so if you are having problems, make a post in the group for assistance troubleshooting.