You may loose a little exceleration, but the heavy flywheel affect provided by a spinner can help a 4-stroke run better and idle lower from my experience. The biggest problem is you need to get it running very well since it is difficult to get an electric starter to work on that big round spinner profile. I have a large spinner on my Albatros and never had any problems hand starting my YS 1.10, but a Saito 1.80 may be a different animal. Here's a photo of my other "hand start model" (by me, not the Baron).