LaVern

In the U.S. in the northwest corner of Pennsylvania. LaVern

Hello All, Its been almost 2 months since I last posted about the 1977 TY250D 493 series that trying I am restoring for my son. Well in the process of replacing the points and condenser I managed to scrape the source coil pretty bad. Apparently the tool to keep the flywheel from turning stuck through too much at one point. I'll post some pictures. Looking at all options I think rewinding the coil would be the most cost effective. But to do that I need the resistance specs on the coil. I have a service manual but it is the European version and it doesn't have any info on an American version. Anyway, the specs I have give 2 different required resistance, one for 9 European countries and that spec is 1.6 ohms. and the specs for the English model is 0.1 ohms. Can anybody give me the specs for a 493 series sold for America? I already have the points and condenser purchased so I should probably try to use the magneto ignition vs. a CDI though the CDI seems to be less maintenance and more reliable. Thanks. LaVern

Feetupfun, Yes I do remember my SL125 and XL175 having tool sets. I guess the opening seems small. As I think of it, pretty interesting engineering, utilizing every cubic inch of space. Thanks for responding. LaVern

Okay. Did they come with a set of tools or was this just a "place" to put some? Thanks for your reply. LaVern

Hi All, I'm getting going on the restoration of the TY250. I got the frame all stripped down except thw triple clamps and the foot pegs. During the process I came across a small area behind the headstock that has a hinged cover which opens from below. It is held closed by a knurled thumbscrew. A bunch of hazel nuts and looks like flower seeds fell out when I open it. What is it for? I'll tr to post some pictures.

Thanks for your input. As you, I think if my son rides it after restoration, it too will not be in competition, but as a trail bike. So perhaps in reality, it isn't a big deal for what it would be used for. I guess I should pick his brain about the level of this "restoration" that he wants. I just go back to the conversation I had with him when he stated with no doubt what so ever that the original flywheel made the bike easier to ride. I now have two other vintage trialers, a 1975 Suzuki RL250, and a 1975 Honda TL250, neither gets ridden in any form of competition, just trail riding. I suspect that will be the role of this bike also. LaVern

That is a possibility. Next question, Why would somebody who competes in trials, want a lighter flywheel? I always thought that the heavier wheel allowed the engine to be run on lower RPMs, especially when coming out of a high RPM situation where increased RPMs would lose traction easier? Of course my understanding could be completely wrong and if so, I welcome a lesson on Vintage Trials practices. I am 71 years old and most of what I know, (and it isn't that much), was acquired in the mid '70s when I first learned about the sport. I never competed and I will admit that most of my understanding of this aspect was from the fact that some of the manufacturers were using standard engines with larger flywheels on their trials models. Also if I remember correctly, replacement with a larger flywheel was a common after market modification at the time. Thanks. LaVern

Well I definitely don't have the one that it came with. The one I have is 25.9mm wide and 4.4mm thick. Substantially smaller, thus lighter. Well thank you everyone who read and answered my post. Now I wonder if I might be able to find one of the original sies. LaVern

Thank you! This will help me figure out just what I have. FIrst thing tomorrow I will check it out, and for anyone interested I will post th dimensions. Thanks again. LaVern

Seems I overlooked this posting. If the dimensions are available they surely would be helpful. The pictures look good. Thanks. LaVern

Okay, I can clearly see the Flywheel on the right has a thicker ring on the outside and I can't say for sure but it looks like mine has a thinner outside ring. I guess without weight and O.D. dimensions I have to assume that the flywheel I have is from a TY250A. It'll still work, but my son says he remembers that the bike was easier to ride with the original fly wheel. Thanks for the pictures. Now I guess I'll go with it. Perhaps I should ask, does anyone know of a source for the heavier wheel? LaVern

And another one. LaVern

Well after returning from our Thanksgiving celebration, my pictures had arrived from my phone to my laptop. I will post them with to see if any one knows by the diameter if not by looking at it, if it is the correct one for my 493 series TY250. I think the number on the outside face of the flywheel is F143-3073. I am not sure what that means or refers to. I have found nothing in my research mentioning those numbers. LaVern

Is there someplace that I might get the actual dimensions and perhaps even the weight? The one I have is 138.86mm, or 5.467" in diameter. I don't have an accurate scale to check the weight. I guess it really doesn't matter. It seems that as long as it works, it will do. It's just that my son has asked if it is possible to get the original, so I'm trying to verify what is the original. I am having problems getting the pictures from my phone to my computer so I can upload them here. I'll have to try later to down load them again. Thanks. LaVern

Italic Keyboard shortcut Ctrl+I I think the flywheel from the TY350 looks completely different according to the views from Yamaha OEM. feetupfun, Do you know if that number is stamped on the flywheel someplace? I haven't been able to see it yet. Perhaps when I get back out in the garage and get it off I can take a close look. Thanks Everyone. LaVern

b40rt, TY350? Did I miss type in the above post? The surgery I had was for cataracts, vision is still a bit blurry, so maybe I did, though I did not see where. If I did, I meant TY250 If not explain please. Thanks LaVern

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

timdog and Old Gezzer, thanks a bunch. My son wants to do a restore on the Yamaha. We'll have to see how that goes. LaVern

TurboFurball, Thanks for the compliments I appreciate it. Intotrials,The tires make the TL a good "trail bike", especially for a 5' 4" 71 yr. old person like myself. Not a racer but a good trail bike. The suspension lacks what modern bikes have, but the reason we went with the trials bikes back in '75 was because the off road bikes at that time were getting taller and taller, making it harder to ride in the woods. My 2008 CRF150F is tall enough to be a problem for me if I get myself in a position where I have to put my feet down on a slope. Also since those pictures were taken, the original kick starter on the TL has broke and several attempts to have it welded have failed. Now there is a lever from a XL250 which is shorter making it harder for my knee to start it. The shorter straighter lever of the XL250 also won't clear the foot peg unless it is folded up out of the way. Thanks for looking and replying. LaVern

Hello every one. I have been registered for a while now, but I never fully explored the Forum sections. Very nice to find manufacturer specific postings. I have several vintage trials bikes. A 1975 Suzuki RL250 which I purchased new. Also a 1975 Honda TL250 that I received from my cousin, who was the original owner of that. I didn't restore them but did "recondition" them. I presently also have a 2008 Honda CRF150F which I bought because my knee does not like the kick starter. At the present time I am working on restoring my son's 1977 Yamaha TY250. He wants to "restore" not just paint it and make it look pretty. I will be more than likely looking in here for help and information on my latest project. If I can figure it out, I will put up several pictures of my Suzuki and Honda after I reconditioned them. And the Yamaha as it is as I start to work on it. I know the TL doesn't have trials tires, and the Suzuki has a few dents in the tank plus the front fender is raised. Thanks for reading my post.

Hi All, New here, this is my first time posting on here. I was searching for a Vintage Trials Forum and found you folks. Looking forward to participating. I am 66 years old, retired and in the process of.... I don't know if I would call it restoring, but I am cleaning up, painting, replacing tires, new decals etc. on my 1974 Suzuki RL250. I am the original and only owner of this bike. I never really rode trials but for the first 10 years I had this I did a lot of woods and trail riding, and as my family grew I sort of put it on the back burner for a while. When I wore out my first set of tires I replaced them with full blown knobbies, replaced the thin seat for something with more padding. I have started it every summer and rode it for a few hours every year. The engine never fails to start with a few kicks and is still giving me 123 -125 psi on a compression test. I've been working on this refreshing for a few months now. Hope to have it completed before summer ends. Well I just thought I'd say hi. LaVern