RE: RCV Engines
I can't comment for sure on the 58CD, however, I have been running the 91CD for about 3-4 years now, and it runs a bit on the Hot side, not as Hot as reported with the 'RCV SP Series Engines'; other than that, my engine runs well, I don't think it puts out the power that other normal 91 size 4 Strokes do such as the OS-90.