Starting an 850 coming out of 12 year storage

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I'm trying to start my 850 after 12 years in the basement.
I took the carbs apart, they looked good, I cleaned them anyway
put it all back together. I've got good spark and gas is getting into the cylinders, fresh gas, good compression.

The bike will run momentarily after I tickle the carbs, then dies.
The choke is on full, fuel taps open, throttle closed.
It revved once when I opened the throttle right after I kicked and it caught. It sounds like it wants to run.

What am I missing here?

Thanks for the help
 
Try taking the carbs apart as much as possible then boiling the carbs and removed parts in soapy water. After boiling for five minutes or so, use compressed air to dry the carbs and get all of the water out of the recesses.

The boiling soapy water is very effective at removing gum/varnish. This method gets every surface and every minute aperature clean.
 
Even better than boiling them, is soaking the metallic parts in a one gallon can of Berryman's Chem Dip for 30 minutes.

Rinse extremely well and blast dry with compressed air.

The stuff is noxious, so use outdoors with a fan blowing the fumes away from you, and use good rubber gloves.
 
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