you are right, if you just compare the chassis then the motogo seiki does not save so much weight. but if I remember it right there were more, mainly plastic things, that you do not use with the new chassis. anyway, there are 2 main weight savers - the battery as you mentioned and the weight shift backwards which made (in my case) the previously needed rear and side weights redundant. I will weigh my car tonight and post the difference before and after.
I just saw that the screws are missing on your second photo. they should add a few gramms... :-)
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