I've always felt the Norton motor was lacking top end, I called Mike at surrey Cycles for a bit of advice, turns out the 600 Dommie motor should have been fitted with either a single or a pair of Monoblocs, mine came with a pair of 926 Concentrics on an aftermarket manifold. He sorted me out with a pair of properly set up 928's to the same specs as the correct Monoblocs, with brass slides fitted, the chokes binned and the pilot holes tapped and blanking screws fitted- to make cleaning the carbs easier. Also supplied a nice pair ofscrew on meshed bellmouths.

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