View Full Version : Need help with 1980 Yamaha 425
07-07-2007, 08:50 PM
I have a 1980 Yamaha 425. It is street legal dirt bike. The one I have does not have a center stand or side sand. I have to lean it up against something. It looks like a side stand can be mounted on the bike. Has anyone out there had this kind of bike?, and if so, did it have a side stand? Does anyone know where I might find one?
Also, the bike leaks gas when it sits. Over a couple of weeks time, all the gas in the tank would leak out. The leak is coming from the carburetor and it leaks even when the gas supply from the tank is shut off. I guess I need to replace the gas shut off valve on the gas tank. Would this likely solve the problem? I was thinking I might also want to rebuild the carburetor because the float might not be working right.
07-08-2007, 07:26 AM
A carb rebuild would fix the gas leak, most likely the float is sticking or mis-adjusted.
I don't know where you can find a sidestand and it probably never had a centerstand. I would guess looking around on bikes of that vintage made by Yamaha you should be able to find somethin'. Where are you located because I couldn't find anything about a Yamaha 425 street legal dirt bike. I could find YZ 425 or an IT 425 but neither of those are street legal. Is it blue or yellow, IT's were blue and YZ's were yellow around that time. Both the IT and YZ are 2 strokes. A sidestand off an IT or YZ would probably work.
07-08-2007, 08:05 PM
I think this one is an IT 425. I would look on the title but it is at my office and I'm home right now. It is blue and it is a 2 stroke. It is street legal. It hadn't been registered in several years when I bought it, but I went into the department of licensing, they pulled up the original record and gave me a current license plate and tabs. It had been registered for street use when it was originally sold. It has lights and mirrors, but no turn signals, a speedometer but just a trip ododometer, so I have no idea how many miles it has on it. I just want to stop the gas leak, find a sidestand if I can, and sell it. It is too noisy for my tastes. I want to buy a new or later model KLR. So you would try to fix the gas leak at the carburetor before changing out the shut off valve? Thanks for your help. I really believe I should be able to find a sidestand somewhere. Yamaha made this bike with different engine sizes for several years. Thanks again.
07-09-2007, 02:12 PM
Yeah I would rebuild the carb before anything else unless the fuel valve just plain doesn't shut off or leaks anyways.
A sidestand off a YZ or any of the IT bikes should fit it or maybe one off a TT500, it have to be fairly long.You'll need the spring alsobut you may be able to find a useable spring at a hardware store. About the best place to find that stuff is on Ebay. Yeah they are loud but would run fast enough to scare you to death. They were an enduro race type bike so it wouldn't have had a speedo just a tripmeter for keepin' tabs on the track's map. Kinda cool you can ride it on the road.
07-09-2007, 05:15 PM
Thanks for the help. I'll let you know how it turns out.
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