engine dies beyond idling

Gentlemen (and ladies)
Thank you again for trying to help me, I make many technical responses to a car forum so I know how much effort you all put in on this helping fellow Norton riders.
So, Jim Schmidt at JSEngineering was very helpful and figured out what was going on. (Thank you Jim!)
My 73 Norotn 850 MkII's gas tank was resin'd many years ago to prevent rusting on the inside. Somehow with age and modern gasoline formulations, and storing the bike this summer, I managed to dissolve some of the coating (and/or a combination of bad gasoline) coat the fuel supply in a horrible dissolved solvent. To me it looked like regular gas hardening that I thought I had cleaned up properly in the bowl. Well, I probably did but dissolved resin kept pouring into the carb while testing. I also had a manifold leak.
So, under a new thread question ask you advise on the tank.
Cheers all,
-Jim

Some of the internal passages were plugged with something that was dissolving in the tank (old Kreem sealer or similar I'm guessing). The removable jet tower that holds the main jet and the idle jet had to be replaced because I couldn't clear the small internal passages. It cleared right up with a new jet tower. I also raised the needle one notch and put in a smaller idle jet to help tune it in. Carb is on its way back to Jim Nash. Jim could use some suggestions as to what sealer is best to use that won't dissolve with todays ethanol/gasoline

Video of the repaired carb being tested on my Atlas below.

[video]http://youtu.be/3EmX4do88Hs[/video]

The dirty jet tower culprit below

Love the little tail swish right off idle and the satisfied grin at the end. Novalac is the most common proven booze resistant 2 part epoxy resin a number of venders sell but verify.

Dear all,
Firstly, I want to thank all of you for taking the time helping me.
My 73 Norton 850 is now running strong and I would like to share with you what happened and how it was fixed from the beginning,
I replaced the two worm out Amal carbs with a single carb arrangement I bought it from Jim Schmidt from JSMotorsport. It came with a 2-1 manifold.
The installation of this setup was bad with an airleak between the engine and the manifold. This was not understood at the time by me. It was a subtle leak.
The bike was then left standing last summer, and in December I started to look at it again, thats where I asked you all for help with this thread.
A previous reconditioning of the gas tank with a resin coating had failed. It totally contaminated the fuel delivery system.
At this time I could not figure out why the bike would not rev but of course the jets kept re-coating themselves with resin after each time I stripped the carb to clean it.
It was Jim Schimidt who helped me realize what was happening, and I then realized what the bad smell was in the tank. Old gas full of diluted resin from inside the tank.
Jim rebuilt/cleaned the carb and tested it for me. I used acetone to remove old resin from the tank, tried various methods to remove the rust inside before successfully refurbishing and resealing it.
Reading all the youtube videos on tank restoration drove me crazy and I did try a couple of methods.
Filling the tank with diet coke did nothing, and electrolysis only cleared up part of the tank that the anode was close to.
I successfully used sheetrock screws to remove the loose rust, 1 gall of Evapo-Rust from autparts to remove all the rust, then Por15 M/C fuel tank repair Kit.
Anyway, I can't thank Jim Schmidt enough for sticking with me and I give him 10/10 for customer support after selling me the single carb setup, Thanks Jim!

-Jim Nash

Thought it might be the needle dropped in. It stopped Mike Edwards at Goodwood Revival last year :

https://www.youtube.com/watch?v=B1JfQ4xb0iA