Hi twhbme, and welcome to Outdoorking.
There are two or three different Quantum 50s, and there may have been running changes in each of them. If you post the long string of numbers on your engine (marked as "Model", "Type" and "Code", and probably on the cowling somewhere) we will know exactly which variant it is, and we can try to find the illustrated parts list for the right one. A picture of the engine would also help.
