| On my intial venture into the 620 class I had a slipping clutch problem dispite using Semi-Synth, My cure has always been to replace a couple of the 1.5mm Steels with 2mm steels and replace 3 of the standard springs with 3 from a 916
I did buy a set of Surflex clutch springs to fit but Matt Larrett borrowed them at Donington in 2009 at the Moto6 round and I haven't seen them since
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