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zombie thread: found a local guy who looked it over. He found a wire that had kinked, been exposed, and was shorting out of the frame. it's working again!!

well I took the cab apart and cleaned it. It looked clean, but at least it started when I tried it again. Runs like garbage though. it kept lurching across the parking lot. like it's not getting enough gas or something. I wish one of my brothers in law was something useful like a small engine...

thanks for the reply. I had googled and come up with this https://www.ebay.com/itm/272833183981?fits=Model%3AST90&hash=item3f862000ed:g:WVkAAOSwaOxZrRH9#rwid but I don't think that will fit right? the throttle is completly different from mine. I have a metal housing that has lights and the on...

I am fortunate enough today to have the day off or I can go ride my st-90 around the woods, and it's working! (I did have to get some starter fluid in the carb for the first start of the day) However, the grips on this thing are old hard rubber with lots of ridges, and they are wearing blisters...

I'll give the leak test a whirl later this week. I also have brake cleaner, wd40, all kinds of stuff. How/where are y'all installing the inline filter? I tried one, but the fuel line was so long to get it to fit that the filter wound up flopping and dangling. a picture would be amazing. I'll...

ok, starter fluid directly in the spark plug hole fired the bike right up! I drove it around for 5-10 minutes, and it ran great. other than having to set the idle higher than it should be to keep it from dying at rest, and occasionally i'd have to rev it just a bit to keep it alive. I turned it...

maybe I can just clean this one? it's got about an hour on it. I replaced it late last year. I couldn't even get it to start by taking the air box off and spraying starter fluid down into the carb.

I don't know the definition of good flow, but fuel certainly drains out. not in a dribble. I also put in a new battery today. Just a little 6V deer feeder battery from tractor supply, but that was what was in it before. Anyway, it tried to start once on the 3rd kick, but then nothing.

well, after successfully starting the bike with the new carb I let it sit the weekend while I was out of town. Now I absolutely cannot get it to start. of course, I couldn't get it to start before the new carb either. I have spark. I have 6V at the battery. I've removed the air filter. I...

I received the ebay carb above today. It installed perfectly on my st90, and fired up on the 2nd crank. I had to increase the idle speed using the adjustment screw up to keep it running, but 20 seconds with a screwdriver and I was in business. It's raining today, so I haven't been able to drive...

I've fought my little st90 for a while, and I've solved most issues, EXCEPT, I'm really struggling with the carburetor. the more I work on it, the worse it gets. I can't hardly get it to start now, and it's leaking gas. I'd love to just buy a cheap carb off the internet and solve all my problems...

well, voltage is 6v right now. I couldn't get it started, so I cannot check that. I took apart the carb and installed an inline fuel filter, and I'm leaking gas from somewhere on the carb. I may just need to buy a new carb. this whole 50 year old dirt bike think is more work than I anticipated...

is this the voltage regulator? https://www.amazon.com/dp/B07CSHMH5B/ref=redir_mobile_desktop?_encoding=UTF8&pd_rd_i=B07CSHMH5Bp13NParams&psc=1&ref_=sspa_mw_detail_1&smid=A1EYXCZKZ0TGKP once I reassemble the carb I'll try and get this thing started again and see what the voltage is doing. Should...

my childhood st90 is in the process of being revived. It is mostly running, but I need a battery for it. The original was super dead after 20 years in a barn, so my enterprising uncle cut out the push connectors and put in a 6v battery for his deer feeder. And lo and behold, it worked. But, a...

I appreciate the offer. I finally got the front forks rebuilt and haven't had a chance to try it yet. I also have to keep in mind that ultimately this bike will be my kids and nephews not for me. But I'll keep you in mind.

and I'm mostly fine with that. I just don't know anything about shocks beyond they compress and are bolted on on both ends. How would I determine what length and stiffness I would need?

My st90 got me through jr high. I loved that thing. But it was already 25 years old at that time. Then it broke and sat in a barn for 25 more years. Now my son is approaching that age, and I'm fixing it up for him. I got it running, mostly cleaned up, and it's a blast. Though it still needs...