I bought the ready-made "tool" from this eBay seller .....
https://www.ebay.com/itm/Carb-Float-Level-Tool-Yamaha-XS400-XS500-XS650-XS750-XS1100-XZ550-77-83/273099883552?ssPageName=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649
But this guy found just the barbs on eBay for less, although he doesn't give a link. See post 38 .....
http://www.xs650.com/threads/1980-sg-back-from-the-dead-–-aka-dad’s-bike.54325/page-2
If you can't wait; metric zerks drill the ball out, add a couple washers to seal the thread, work pretty good. 90 degree type are nice but; aiming the barb on the 90d type can be a bit of a challenge...
Another "if you cant wait option"... modified M8-1 bolt with M5 (or 10-32) barb fitting...
Better than sitting in a recliner watching Judge Judy re runs!
Getting a bald spot from scratching my head here, I'll assume new float valves and seats? I'll go a step further and assume one or both aren't seating properly. A round tuit of mine; I have often meant to make a float test rig with a supply tank of mineral spirits, valve, fuel line, a small pan and way to hold the carb. An outboard "squeeze bulb" return line would be the cats PJ's. you wouldn't need the float bowl on the carb, so the set, check, adjust, cycle would be fast and painless.
Also I keep meaning to find the right needle with a viton tip to replace the all steel bs38 stocker. 5T recently mentioned a couple "may fits".
Grab a q-tip, some chrome polish and a drill and hit those seats a few times? What I do if I'm not replacing seats.
As some of you have suggested it could’ve been a fluke.
Would be Easy to try to flush out the debris with the drains removed and turning the gas supply on and off ? Tap on the float bowls too while trying to "shake it loose" ?Bob: I wonder if the leak would settle down after a few minutes of running....
ordered a pair, shipping was cheap $4 so $14 for a pair. will report.Supposedly, these are the viton needles that work. I can't say for sure as I've never tried them .....
https://4into1.com/k-l-keihin-float-needle-rubber-viton-tip-honda-cm200t-cb400t-cx500-cb550-cb750/
Here's an old thread where the suggestion came from, starting at post #24 .....
http://www.xs650.com/threads/rebuilt-carbs-overflowing-random.15344/page-2
Supposedly, these are the viton needles that work. I can't say for sure as I've never tried them .....
https://4into1.com/k-l-keihin-float-needle-rubber-viton-tip-honda-cm200t-cb400t-cx500-cb550-cb750/
Here's an old thread where the suggestion came from, starting at post #24 .....
http://www.xs650.com/threads/rebuilt-carbs-overflowing-random.15344/page-2
Have you checked the floats for leaks? Yeah, they're new, but check them while you can, before assembly.
Scott
Just wondering how your starter plunger looks, is it seating well if not it will run rich.. How does the rubber pad look. When I listened to your start up it sounded like the choke was on.I only use the chock for a short time and then put a piece of paper between the throttle stop screw and throttle lever(which raises the rpm) until it warms up. Did you sync the cables so they are lifting at the same time. Are you able to check the vacuum and adjust so both are pulling the same, then adjust your cables. Make sure your start the pilot screws at 1 turn out. Mine are very fussy and will cause it to run rich if not adjusted right.