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Old 02-13-2009, 04:11 PM
Jimmy Skids
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Default RE: YS63 FZ plunger

YS at one point went to a larger plunger for the crank case mounted requlators. They eventually went back to the smaller plunger because the larger ones were binding up on the regulator housing. The concept behind the larger surface area was that the diaphram would last longer, however with the issues surrounding the larger plunger the wear issue wasn't as big a deal. I've known some YS owners to "take a little off" the larger plungers surface area to lessen this problem, or as I did on my 110's, just replace with the smaller version. Either way, you will be fine with the smaller version.