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Old 02-13-2009, 06:15 PM
Jimmy Skids
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Default RE: YS63 FZ plunger

You are correct with regards to the wear pattern on the diaphram, however, these things seldom need replacement with the smaller plunger as well. As for the large vs. small plunger, if your larger one works then keep using it, if it has stopped working then the smaller one will work just as well. I read somewhere that the diaphrams seldom need replacing and that most guys would only replace when doing regular maintence. The diagram shown on the Central hobbies site is that of the original 63 FZ, I would assume that you have an updated version (larger plunger) and I would bet that the diagram that came with your motor does not show the change.