Well, on the carb body, I seem to be missing what you call the airbox. Because there is a square wire clip to hold something big and boxed shape on but nothing else. Is the missing part a filter? What can I substitute with?
See photo of my carb... http://www.mardens.com/moped/
What is the suggested method for cleaning a fuel tank?
There is a black handled switchy thingy on the right handlebar (mine is missing the cable which I'm trying to replace tomorrow). Is this the decompressor valve that starts the engine? Which position is on/off.