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What size spanner for tappets on a Douglas 600?

Started by summers1, 07 May 2017 at 21:12

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hi can someone tell me what size spanner i need for the tappets on a 600,thanks ian


Which one?

A 600cc 4hp, OB, OC, 600EW, E/F28-29, DT6, T6/S6, F/G31-32, OW1, Wessex, Greyhound, 600Aero?





O.k., that I can answer. The 250/350/500/600cc Aero tappet adjuster has a 3/8 inch hex milled on it. The jam nut is 7/16 inch. Not sure why they did not just use the prevailing Whitworth wrench hex sizes, but they didn't.