Drill bits

Performance Bikes (UK) - - The Garage | 360º Garage -

‘De­pend­ing on what crank you run you may need to re­strict oil pres­sure around a Nor­ton en­gine. A nor­mal roller crank mo­tor runs 10psi, but a plain big-end needs 40psi, so you need to re­duce the oil pres­sure to the cam box by a fac­tor of 10, with a jet. I make all my own jets with a 30-thou hole in them to re­duce pres­sure to 3psi.’

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