All in all, your reduction was minimal compared to an 8lb flywheel. The reason that I have been asking these questions is that there was a pretty detailed discussion on the topic without any real evidence prior to this and there was a lot of speculation. I am glad that you have seen benefits from this, I just dont want people to think that there is validity in "less-is-more" and shoot for the lightest possible, as there are significant problems with ultra light flywheels. It is amazing how heavy that flywheel is for a 1.1L engine, I would think that you could almost get away with a 18lb, or ~8kg flywheel on such a small engine. And by get away, I mean that it would function as was intended without any drawbacks. It is alot like the over 20 lb flywheel on a BMW opposed twin motorcycle, not really necessary.
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