82 xj750 starts but doesnt run long

I just picked up a 1982 750 that was refurbished 6 years ago but it has been sitting for a couple years. I have an identical bike at home, so I picked this bike up as an easy project while I'm in Utah. I started by cleaning out the tank and taking the carbs out and hitting it with a bunch of carb cleaner and freeing up the throttle plates, which were stuck. I put everything back together and now it starts but only for a second or two before shutting off. The fuel line did have a in line filter, but I replaced it with a regular line and it does the same thing. Could this issue be caused by clogged jets. I haven't messed around with carburetors much, so these might be dumb questions but should I get a rebuild kit? If I do, would I then have to sync the carbs after that? If that's the case, would it be best to take it to someone to do it because I don't have my YICS shut off tool here? I wouldn't normally go to the forum this fast, but I am a little pressed for time and I would like to get this done before I leave. Also, what would you guys recommend on replacing on a bike that's been sitting a while? Thank you so much.


Attached below is a video of it starting for a second-

 

Freeing up throttle plates is not nearly enough. Jets and holes are probably blocked or partially blocked. There is usually no need for a rebuild kit per se. You will probably need to replace bowl gaskets, enrichment well o-rings and throttle shaft seals, but most other parts don't wear out easily. Read up on this: Church of Clean

 

Okay, thank you so much. I’ll get on that

 

Since it starts with starting fluid, I would suspect that particular problem is with the "starter" jet in the float bowl being plugged. Make sure you follow the instructions on how to clean them out (fairly difficult but necessary). Do not skip any other steps though.

 

The full Church of Clean is the correct treatment. Since you are on the road and limited on time, I'll offer the incorrect treatment also. You are starting on carb cleaner, that's a great sign, and just need fuel now. After sitting, the gunk will notoriously be in the bottom of the carb bowls. Also your float needles might be stuck and you may not be even putting fuel in the bowls.

Pull the carbs, pull the bowls, clean the choke jets in the bowls, make sure your needles and floats work. You can probably make it run and do a full proper cleanout when you get back to your tools.

 

And sorry to confuse the terminology...starter jet as @Huntchuks said...choke jet, enrichment jet...all the same thing. Here's a photo of the bowl (lifted from ebay). Make sure you can blast carb cleaner in the orifice in the bottom of the bowl and shoot it out the top. You can also shine a flashlight in the bottom hole and sight down the top hole to see a pin point of light if its clear. A tiny drill bit, or wire can clear it, but the jet is small and can be difficult.



And then also check the pilot jet in the main carb body. They are also tiny and can easily plug from sitting. Everything else in the carb is relatively large, so if it looks clean, there's a good chance it will be ok. If you don't have a proper fitting screwdriver to remove the pilot jet, don't risk buggering them now and just get a set of torch tip cleaners (the smallest you can find) to make sure the pilot jet is clear. Carb cleaner and compressed air if you got em. And again, this is a quicky method and you can do the full teardown later on.