Turbo Seca problems, part II

A little help on this one from the Turbo Seca owners out there?
As well as I know the Seca's and Maxims, the Turbo Seca has me a bit askew....
After removing and thoroughly cleaning the carbs, being careful to ensure all the passages were unplugged and clear, I reassembled the carbs using all new O rings, seals and float needles from Chacal. After reassembly, I checked to make sure float height was "approximately" at float bowl parting surface level using clear tubing......so far, so good. Slapped carbs back on, got engine started, synched using YICS tool. So far, so good...except, synch vacuum seemed low-12-14cm range. Anyway, bike ran and idled, mixture screws out 1-1/2 turns. (No 14mm colortune; the 12 won't fit, for some strange reason!) Well, after starting the bike today, I notice it's real sluggish on the throttle, even though it idles. Strong smell of gasoline. Turns out #s 3 and 4 are cold to the touch (yes, they have spark!) I mean the HEADER pipes are cold......stone cold! I pull the plugs to do a compression test...just because...best compressions I've seen in a long time; 135,132,135,140. Don't get much better than that! But while I'm cranking it over for the compression test, I notice fuel spraying out of #3 and 4 plug hole. And a fuelly-smelling mixture of oil, gas and soot is leaking from the left side exhaust. Obviously #3 & 4 are seriously flooding. Any ideas that don't involve pulling the carbs down again? Did I miss something? Any hidden bugaboos I don't know about? Any and all help is appreciated!!

 

could be the float needles not seating properly.
with the vac # it doesn't matter the # as long as they are all the same.

 

They will read low if a cylinder(s) isn't firing.

 

Do the float level test on the bike, with the clear tube.

This should have been done on the bench before the carbs went back on- - the "flood test" (and don't use windshield washer fluid , use real gasoline, and be careful).

 

You could try to lightly tap the float bowls on #3 and #4 carb. It's likely the float is stuck.

LIGHTLY tap, with the handle of a screwdriver.

 

It was. Float levels were "approximately" a little below the parting surface line, but the seal on the clear tubing I stuck in the bowl drain holes was leaking a little. In no instance did the fuel level rise above the parting line.
I doubt the problem is a sticking float valve. Those carbs were operating room clean and all the needles were new parts from Chacal.

 

Did that. It didn't help.

 

Thanks for all the suggestions so far! I've tried everything I know of short of pulling the carbs again and getting an actual "to-the-T" float measurement. I'm wondering if there is anything else in the goofy fuel system, with it's fuel pump, regulator, and return system that could malfunction and flood the engine, and if anyone has seen this problem rear it's ugly head before.

 

I think 12-14 cm is a little low myself.
At this point let me add that I believe this problem was occurring prior to me working on it; hence the very hard starting and gas leaking into the oil.

 

No other ideas? Otherwise, carbs are gonna have to come back off.....

 

i know that when i had mine off
(like a total of 12 times on and off)
i had to replace the rubber o ring around the needle seat
this made mine leak after about 5 minutes

 

I changed those, also. (Chacal)
I've pulled the carbs off again. It seems the fuel levels are fine for about five minutes, then #1 and #3 levels start creeping up above parting surface level. Since the needles are new, I believe either the needle seats are bad or the floats are saturating after a few minutes. I'll keep you posted.

 

Possibles: (Among other things)

Reversed AIR Jets
Reversed FUEL Jets
Loose Main Jets fell-out

That's a lot of gas. Something is leaking or not in the right place.

 

Reversed AIR Jets......Nope.
Reversed FUEL Jets....Nope.
Loose Main Jets fell-out.......Nope.

Everything was carefully segregated and reinstalled. I even double checked to see that #'s 1/4 and 2/3 main jets were installed correctly (they are different sizes on the BS30) Just for $hits and giggles I switched floats between 1 and 2 carbs....guess what? Float levels held their own for 5 minutes. No fuel pouring out of the carbs. Why? I have no idea. But I'm ready to try throwing them back on again.

 

yep
i know the frustration when you try try and again try
i know that when i did mine like i said it was a very small detail
that i overlooked ( so i thought)
but check those again, because that was the same identical and i mean the exact same symptoms i had
starts right up and runs great for five minutes then gas would come out like an opec nation
main jet cylinders have to be very snug when you pop them in i used new rubber o rings on mine (twist and push down)
and then with the little forked arm that holds them down nake sure that it PUSHES the thing down and holds it
pour some gas around it to see if it leaks by?
thats where the troubles were on mine