headpipe diameter and design

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    Header diameter on a small 4 stroke single

    I may have posted about this before, but.... Things is, I have this long term Suzuki 125 project, originally meant for my youngest son. A Suzuki GN125 converted to a mini street tracker. 3.25x18 tyres at both ends, and a 70 mm shortened fork took care of levelling it. The engine got a 61 mm 11:1...
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