Re: Racing valve springs? (or not)
I've been told by someone that JHS played with duration etc on them as well but don't know by how much.
From another POV they have 1.3mm extra (intake) and 2.6mm (exhaust) over stock!
Druid
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'00 SV700S - '94 RVF400R - '97 RVF400R - '88 VFR750F
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