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... SPRITE If this operation has the effect of stopping the engine it is an indication that the mixture setting is too weak. If an appreciable speed increase occurs and continues to occur when the piston is raised as much as J in. (6 mm.) it is an indication that the mixture is too rich. (6) When the rear carburetter mixture setting has been carried out correctly release its throttle adjusting screw so that it is clear of the stop and the throttle is completely closed, and lift the piston | in. (13 mm.) to render it inoperative. Then repeat the jetadjusting operations on the front carburetter. (7) When both carburetters are correctly adjusted individually for mixture strength the throttles of each should be set so as to give the required slowrunning and synchronisation. Slowrunning and Synchronisation: Screw each throttle lever adjusting screw so that its end is only just making contact with the web on the carburetter body, then give each screw one full turn exactly. Start the engine, which will now idle on the fast side. Unscrew each throttle lever adjusting screw an equal amount, a fraction of a turn at a time until the desired slowrunning speed is achieved. Correct synchronisation can be checked by listening at each carburetter air intake in turn through a length of rubber tube and noticing if the noise produced by the incoming air is the same ...