The reason 45mm would be better is although the absolute peak power would drop slightly, the dip in the power curve around 8k would be a lot less noticeable and the step in diameters over the last bit looks ugly! Please don`t hunt me down and kill me
Love it though, took mine from 57.1bhp to 62.4bhp.
And I know the dip shouldn`t bother me as it`s on a race bike and I should always be above it, but we all make little mistakes and when you do the last thing you need is a dip in the power curve. That said it hangs onto the power nicely.
So on the whole very pleased, why not do a twin stack rear with 42mm bore to fit the pipework like the HRC and MHP kits. To fit the standard Tyga front bits. You`ll sell one to me straight away.
Sorry if 4 stroke discussions aren`t allowed.
BTW running 120 dynojet mains and FI jet kit needles.
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NC30 racer, MC18 toy bike and SV650S "Adult days" bike.