Hi yes we machined down the boss that came in the bike to be same diameter along its length as people recommend ,and then I tried the bike it was no better at all it would do 30 31 32 mph tops so we moved on to the cdi box my chap that was doing this work for me phoned Kymco and spoke to a very helpful lady who went into great detail about the workings of a cdi box and how to derestrict apparently this violet coloured wire is a electronic rev limiter so you need to do both the boss and the violet coloured cdi wire fix to get the full benefit .
Hope this helps
BigB32
