there are four carbs
he did adjust the float height correct stock height?
also there is a brass screw inside the bowls need to know how many turns?
and a smaller screw outside the bowl how many turn?
i also read in the FAQ section that a guy used an eighth inch drill bit to set something... the barrel pistons maybe
this is the relevant part of the post
"I need to sync my carbs but have no vaccum meter. How do I bench-sync?
When I rebuild a set of carbs, I always bench sync them before I re-intall them. Basically, I use a 1/8" drill bit as a gage. Here's how you do it: Adjust the idle screw (the main one) until the 1 carb outside of it is open enough to just let the 1/8" drill bit through. Then adjust the _sync_ screws on the other 3 carbs until the drill bit just fits them as well. You'll probably want to close the idle screw before you bolt them back on the bike, 1/8" openeing is pretty big. This isn't a perfect sync, as there are other things that will affect the airflow to a given cylinder, but it will get you pretty close.
My note - the 1/8th drill bit may be a bit to big. Some guys use a paper clip and resident carb expert TT uses the light method where he will adjust the slides to just be able to see light coming through at the bottom. Make sure your idle screw is all the way out during the sync."
i didnt know what he was talking about and it was late last night.. may have been a mistake to keep working. oh well, here we are.
so what i did was open the top of the carb and adjust the height screws for the ??pistons??
it was a brass set screw with a jam nut
only three carbs had them so i assumed that it should be set in reference to the one without
i then proceeded to open the idle until i could fit the drill bit in and then set the others to match.
sounds like a mess to me.... sorry for the complication and thanks for any help.
matthew
That's quite the can of worms you've opened. For your own sake, and sanity, please don't make adjustments until you know exactly what you're doing.
You're talking about several separate systems within the carburetors that each require their own level of knowledge, available information and tools/gauges. These carbs can be very simple to work on, but you need to approach them one system at a time.
First of all, you need a shop manual to provide you with the basic specs like float height and idle mix screw setting. If you don't have one or can't get one easily they are available for free download. I'm sure there's a link somewhere either in the FAQ's or in the Tricks & Tips section. This is a must-have when owning/maintaining an old bike. Your fellow forum members are here to help you beyond that, but we're not here to replace a good shop manual.
The smaller screw you're talking about on the outside of the float bowl is the idle mix screw. The factory setting, and subsequent tuning adjustment procedure, for this should be detailed in your manual. There is no adjustable screw inside the float bowl that I know of (unless the '77 carbs are way different than I ever expected). You may be looking at the main jet thinking it's an adjustable screw because it has a slot for a screwdriver in it.
I'll help as much as I can when I come back in the house, but I have a rare evening to spend in the garage working on my own bikes and I intend to make as much use of it as I can.
