You can always buy the S3 head with removable inserts. I took 2.2mm off my head with no worries whatsoever.
I put a 174 main jet in today (tried 172), they both feel roughly the same, 178 is definitely too rich as when you whack it wide open in neutral it 4 strokes and smokes like hell. I have gained a lot of low, mid and upper mid range power, but the bike feels flat on top (this is on the road, not the track), is this just the nature of the beast or is something killing my power?
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear
2016 RM-Z450
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