this little item came up in my Fuego ramblings but I thought that it may be worthy of general notice.
Hidden away in the octopus of hoses holding down the carby was this tiny restrictor, a black thing as big as two grains of rice with a metering hole the size of fine fuse wire. Just made to be lost, if you dropped it, the parts gremlin that lives on the floor would never let you find it....
This item is not in the manual, well, I couldn't find it, so all the answers are not in the book. The lesson is to very carefully inspect bits of hose that you are replacing....
You wonder how many of like items have been tossed in the belief that the nice new bit of hose will be much better that old cruddy bit.