The nub ended up being 0.158" so near enough to 0.040". Definitely noticeable down low just not as obvious when every gear change is 11 000rpm., the +1 front sprocket probably dulls it a bit, other mods are cut the arse out of the airbox and Danmoto shorty + the EJK. Got the FZ6 cams to go in yet, cr10 plugs and 2 short velocity stacks to swap in, last will be a clutch upgrade.