Got a chance to fit up the massive flywheel weight. I was using the 2T flywheel weight which is about 8 oz and the S3 I tried this weekend was 24 oz. I want to begin say thatthe motor really is not particularly affected by the weight as far as revving goes. When you crack the throttle there is only a slight hesitation. Where the weight really shines is powering out of a corner the power is so smooth and right there. I did not stall the motor once this weekend and I am usually good for that a few times going through some rutted downhill off camber corners. I have rode some bikes with a large flywheel and thought they were doggy, but I am beginning to think that bike I rode was not really running at peak potential with or without the weight. I would recommend the S3 weight to anybody with a 2k3 ignition.