yeah it is. im trying to start mine now and it isnt even starting at all. 100 main might be a bit to lean as it having trouble with the petrol getting to it and wont kick over. i put engine starter through the carby and it kicked over but it didnt really help. yous reckon i should put the #104 main back in? and the clip is one below the middle aswell, would that make much of a difference.