Got a chance to use the dyno this evening, and I think I finally got my carbs close to sorted.

I was initially having problems with a huge dead zone between 5k and 7k RPM.  I'd come out of a turn looking to launch and instead the bike would buck and sputter it's way up to 7k RPM, and then launch like it was on a mission to make up for the recently lost time.  Unfortunately that delay would be long enough for the pesky EX500 I was trying to get around to point and shoot and muscle by me... again.

First thought, play with the needles (Carbs got a Dynojet jet kit installed as race prep before the season started).  I pulled the carb tops off to discover a busted spring on the left.  Well, that'd explain a lot I figured.  I was at the track so I made due by relinking the two spring bits with a twist and jamming it back together.  I tried riding around the dead zone, but it wasn't really working all that well.

Back from the race, right to the shop to order up new springs and diaphragms as I wasn't going to risk having the spring half having poked a hole in one while it was trashed, plus they're from 91, they're due for a swap.  New springs arrived, so I set to making repairs.  Carb one, new spring and diaphragm, check.  Carb two, and another broken spring?!  It wasn't broken at the track, so it let go after I inspected it and did two more races, cute.  Good thing I planned on replacing it anyways.

Carbs reassembled, I got to use the dyno to verify that my repairs had solved my problems.

No such luck, exact same problem, same spot in the rev range... so my carbs were working even with busted springs?!  Impressive...

Back to the jetting drawing board, after a little experimentation, it's now pulling cleanly from idle right up through the rev range.  There is still a slight dip around 6k RPM, but the other GS500E that's been on that dyno showed the same thing.  I also see the dyno on gstwin.com has a matching dip.  Anyone know how to get rid of it? : )

Jet it with an O2 sensor, and you'd know what that dip is because of.
Then mark the throttle position the dip occours at and that will give you what part of the carb its using.
Then adjust that part alone just a hair in the direction pointed by the O2 sensor.
Cool.
Buddha.

Problem is at WOT, haven't bothered getting picky about partial throttle as much as it A) hasn't been a problem and B) doesn't occur on the track. : )

It's acting rich in that one spot, but if I play with the mains or needles when I try to clean it up, I kill it every where else.  It likes the mix over the rest of the rev range, it's just a little 1k RPM numb spot that it suddenly gets rich over.  It's like I'm hitting some magic harmonic that generates much more signal all of a sudden.

Maybe check the float level. You may be a wee bit high.
Also with DJ, maybe that sudden sharpening of the needle spot ... may be inevitable. Gradual tapers work a lot better IMHO.
Cool.
Buddha.

I think you're right on needles, ended up going back to stock early on.  Float height right now is just above carb bowl seam at it's highest point, carbs on bike (Tested with tube method).  I plan on pulling the carbs and setting the float height properly after this weekend is over, I mainly just wanted to verify the levels were similar to eliminate wildly mismatched carbs as a problem.