While I'm not a 100kg's lol, more like 99.8 I set my rear sag up between 0 and 2mm unloaded (more like you would exspect on a 125). This gives me no touble at all as long as the correct spring is fitted. Andy knows I had a few troubles getting the right one for the F3 shock, but it does feel great now.
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If I have to take the carbs off once more...