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... MAINTENANCE In order to adjust the carburetters successfully it is necessary to remove the air cleaners and intake pipe assembly from the carburetters and engine valve cover and make sure the pistons work freely and the jets are properly centred. Adjusting the Jets: (1) Slacken off the pinchbolt of one of the spring coupling clips locating the carburetter interconnecting shaft to the carburetter throttle spindles and also release the two screws securing the choke spring to the jet levers, so that each carburetter can be operated independently. (2) Release the throttle lever adjusting screws until both throttles are completely closed. (3) Turn the throttle lever adjusting screw for the rear car buretter clockwise until it is just touching the web on the carburetter body and then give it one full turn. This will set the rear carburetter for fast idling and leave the front one out of action. This can be ensured further by lifting the front carburetter piston a matter of I in. (13 mm.). (4) With the engine running, set the jet adjusting screw for the rear carburetter so that a mixture strength is obtained which will give the best running speed for this throttle opening, taking care to see that the jet head is kept in firm contact with the adjusting nut the whole time. (5) The correctness or otherwise of this setting can be checked by raising the suction ...
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