imported post
OK, it's running again. As well as before anyway. Still have the very irritating and irreparable 'off-idle out of sync' problem but it's running on all four again.
I took the carbs off last night and then got some rest before looking at them. WITH READING GLASSES. I found a tiny black something, stuckin the number 2 float needle seat. It required a 5# sledge and cold chisel to remove, but I got it out of there. OK, just some carb cleaner and a Q-Tip. I liked the story better the other way though.
Anyway I wondered how the filter screen fell off the seat and allowed that morsel to pass. I put it back on and it fell off again. After checking, they were all loose. Luckily, Ride&Slide Jim had sent me some of his old parts, and his screens fit snugly, as they should.
Just because it didn't seem like that microscopic black bit could be making the bike run so badly I pulled and cleaned all the jets too. I didn't find any that were obviousy gunked up though. Anyway it's running now, so I can finish cleaning it up and get it back on the road. This has been a struggle.
And Jim...Thank you. What I needed, when I needed it.
To everybody else with all the help and suggestions. Thank you as well. I don't acknowledge all the replies, but believe me, I read and check every single suggestion.