BigT

GS 1000s don't have VINs, they have serial numbers Pogster, post up a picture or two for better identification

Zman, That is correct. Replace that part and keep on building Here's a tutorial for the VM carbs gsarchive.bwringer.com

Is this a new bike to you? Or, was it running fine before?

You should also check the holes in the carbs the fuel screws fit into. People often overtighten the fuel screws, enlarging the holes

Oil leak could be a number of things -oil pressure switch, cam chain tensioner, valve cover Degrease and spray with foot powder to find what's leaking. 42 year old gaskets are known to fail

The first thing is that the Mikuni and Dynojet numbers are not the same Second is the Dynojet kit should have adjustable needles

yes, a lot of parts went NLA in the past few years Just to clarify, is yours the single, or twin disc model? I can't keep up with the differences by country

I think he means hydrogen peroxide

You should be able to buy a new reservoir from Suzuki The originals tend to get brittle over time

Uh, no, just no

I don't think you need any any O rings with the Cometic gasket Lots of oii is generally the valve cover gasket

To answer your question, yes, a GS motor will run with zero valve clearance Then, it gets harder and harder to start and gets parked for a long time Since you are following the factory method, be sure and rotate the motor several time and recheck the clearance You can go to a 2.35 shim in that example, many people run .1 mm clearance The clearances diminish over time

If you don't know that your petcock has a fuel filter, well If you have a fuel filter in line, it can't be for a FI motor

I'd check to see if the unnecessary fuel filter is flowing fuel

all 650s are 673 cc

The tank has one overflow hose for the fuel sending unit. The carbs have 2 vent hoses for the float bowls and one vacuum line on the #3 carb, it connects to the vacuum port on the fuel tap

Well, I hope you followed the tutorial before reassembly. The small passages in the carb body don't clean by spritzing carb cleaner thru them 3rd cylinder? Third from left, as you sit on the bike? Be sure the vacuum port is either capped, or connected to the fuel tap

Yeah, Ed knows BS carbs and how to clean them. Cleaning is the important step, for get rebuild kits

Yes, you should replace that screw, and check the hole in the carb body where the tip fits. And, go back up to the carb cleaning link I posted, because years of experience says cutting corners means you'll be cleaning them again

The pilot fuel screw (not an idle screw) does not appear in the manual, or diagrams, because it is "factory set" and covered with a cap at the factory. You set it at 3/4-7/8 turn out from lightly seated for stock/ airbox. 1 -1 1/4 turns out if you've got headers, pods,cams, etc lightly seated because it's very easy to break the tip of the needle off in the carb body. Check to confirm that the needle has a long tip and the hole in the carb body is open to the carb bore. set the pilot fuel screw as above and tune the idle mixture with the pilot air screw on the side. Easiest to do with a Colortune, but high idle method works well Remember, this only sets the idle mixture. Off idle is cutaway, then needle/needle jet up past half throttle, then the main jet over half throttle

I've had good luck and fast service with their products, here in the States

Also could be a bad fuel trap, and fuel is running down the vacuum line into #3. check the vacuum line for fuel.

I am just old and cranky, and remember Joan Claybrook's hatred of motorcycles

Making the mixture leaner won't solve that issue. Gotta be over 3,000 rpm if you want a good response

Actually, no. The gas crises started in 1973. During the Carter years (77-81) he appointed do gooder Joan Claybrook to head NHTSA (traffic safety). She, and others were alarmed by the increased speed of motorcycles at that time. They thought of banning bikes over a certain size (which lead to the Turbo bikes of the 80s), but had to settle for the 80 mph speedometer. since cooler heads prevailed. A sad chapter of US history. The speedo limit was later reversed.