i did adjust both screws. i think i got it back to normal just now, except now it backfires through the carb. I LOVE owning a vintage bike. there is nothing better than waking up at 7:00 AM to work on it.
Sounds like you are having a lot of fun, which is great. That is what these things are all about!!
Check the air cleaner to make sure it is not real dirty.
The idle mixture screw takes very fine (small) adjustments. Having said that, turn the screw all the way in counting the number of turns until you can feel the needle making contact with the seat. Be gentle since this is probably a very fine brass needle screw. Then take the screw out completely and spray out the orifice with carb cleaner. Use the little red tube and get the end of that right up there in the hole and really spray it out. Then reinstall the needle screw all the way in and then back it out the number of turns you counted (I would bet that was around 2 1/2 turns).
Crank the bike up and let it idle until warmed up. If you use the choke or enricher to start the bike, close that as soon as you can to let the bike run without it. Even if the idle is rough, let it warm up.
Once warmed up, adjust the idle mixture screw in very fine increments (1/8 to 1/4 turns) until the bike seems to be at the highest rpm sound (or gauge reading if you have one!!). Go in first until the engine starts to dog down, and then back it out until the engine is at highest rpm. You may have to go back and forth until you find the sweet spot. Then back it out another 1/8th. After the mixture is set, you can adjust your throttle stop screw to the recommended idle (probably around 1,000 rpm but check the book).
If the settings have been way off, you might have to repeat the setting steps above (not the cleaning) to get things right. Adjust the mixture and then the idle.
Have FUN!! It is not a rocket, only a bike. And as long as you have oil in the engine, you can't really hurt it.
TQ
