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As can only be found in an Italian manual , nothing specific what so ever :) . However the real challenge, (more often than not ) is to get the pump to actually prime to test for settings ! My favourite method , is with the motor running (and everything removed from the mouth of the carb) , take a piece of wood (large enough to cover the mouth of the carb) and whack the throttle openand then cover the mouth of the carb with the wood. Turn it off, if it hasn't stalled and then check to see if it squirts when opening thethrottle, sounds crude but fast and effective ! Peter