LaVern Posted November 8, 2022 Report Share Posted November 8, 2022 (edited) Hello Everyone, I just posted my intro a few days ago, and in part of that intro I showed my current project, my son's TY250. My question regards the flywheel on the TYs. This TY is a 493-200127, which makes it a 1977 vintage. Were the flywheels made extra heavy for them, and are they distinguishable from other 250 Yamahas of that time frame? I ask this because somewhere around 1992 or 93 my son bought this bike. He rode it for a while until one day it quit on him, no spark. My brother-in-law and I came to the conclusion that it was a problem with the points an no matter what we tried, could not remove the flywheel. I recall we messed up a wheel puller in the process. We ended up cutting the flywheel off. We acquired another flywheel from a 250 Yamaha at a motorcycle recycle yard. The owner of the yard said it was from a TY because it had the added ring for weight on the flywheel. It ran great for a few years until my son decided he wanted to ride Harley's, choppers and such and he parked the TY. Now I have it and I am in the process of restoring it for him. He tells me that he recalls the replacement flywheel was not the same as the original we cut off. I don't remember but I'm taking his word for it. So my question is, how can one know whether it is the right one? Obviously it worked for a few years until he parked it, so the question, is it the right one? I am laid up for a few days now from some minor surgery, so I know I won't be able to pull it off, but perhaps I can get a picture of it still on the engine. I did find the PT. # of the correct one from several different Yamaha OEM parts sites, #493-81350-11-00. They all had the same number but I haven't been able to find a number on the flywheel that looks like that. The pictures they show certainly do look like the right one with the added ring bolted on the outside, but my son says he remembers specifically that it did not run the same on low end. Anyway, in a few days I'll try to get if off or at least get pictures and dimensions. I'll try to put a picture up from Yamaha OEM. It shows the same type of ring bolted on as the one I have. Thanks for looking. LaVern Edited November 8, 2022 by LaVern Quote Link to comment Share on other sites More sharing options...
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