FWIW
There seems to be an unusual amount of variation between succesful jetting especially between US and UK. There are various theories why. I suspect that the majority in UK need tight, technical settings where the majority in US need more open, fast setups. But that is both a generalisation and theory not fact. There may also be issues with fuel differences between our countries. I tried the LTR setup and it made my 300 run like a dog in the woods. My best setup was using a CCK needle, 42P & 180M. May have some of that wrong but it was definitely CCK needle - smoothest power delivery. You can jet them to be more explosive if you want.
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