MC bleeding and rich condition after syncing carbs?? 86 vfr750f rc24

howdy guys - i balanced my carbs 2 months ago.. bike was running quite well.. it seemed to pickup a bit on the low end - anyways, mine is the rc24, and manual says 2 1/2 turns out, for the fg/fk. I cleaned carbs 3 1/2 months ago (twice) cos my pilots were dirty and it was back firing etc..

I have a SS exhaust and i regularly rub the inside with my finger to she hows shes running - lately been getting black powder, since the balance.. choke is not sticking - i have already run bike at 1 / 34 turns and am now down to 1 1/2(!) - just did a 40km ride mostly highway moderately hard and found a little bit of black powder once again and i cleaned it really wel with scotch pad before leaving.. I know my air filter is fine (K&N)..

any thoughts?

Also - cleaned all pistons and flushed all brakes - but blimey what i thought would take 1 1/2 hours took a day and a half! Brakes are better but 50% of the lever travel hardly does anything. I removed mc twice, blew it out - still! it was def braking better b4.

I did alot of reading and the lever is currently tied under pressure - ill see what its like in the morning. I must have bled the system for AGES till not a single bubble came thru..

I tried all the tricks - tapping with hammer / priming MC / what i noticed is when i let the lever fick forward theres a funny sizzling sound coming from the mc - and tiny tiny bubbles come out, although its gotten less - and i noticed that at one point the mc was sucking back on the brake system, instead of drawing fluid from the reservoir as is expected (this during bleeding)..

so im stumped - never been set back so badly by brakes(!!)


any ideas here??

 

(oh bike starts runs/idles and drives ok - nothing seems wrong).. consumption seems good - but trying to get her running as best as i can..

 

A friend of mine bought one of these....

http://www.harborfreight.com/brake-bleeder-and-vacuum-pump-kit-60770.html

We did his front brakes on his KZ with it and it worked great! We used it after a complete rebuild so the system was completely dry. You just fill the master cylinder reservoir, hook up the pump to the bleed screw on the caliper, pull some vacuum on it, crack the bleed screw and it pulls the fresh fluid into the system. Just make sure you don't let the reservoir empty out or it will pull air into the system and you'll get to start over. I poured fluid in the reservoir while he kept a vacuum drawing fluid in until no more bubbles. Took all of 2 minutes and the lever feel is excellent! No sponginess at all.

The trick is you must put a few wraps of thread tape on the threads of the bleed screw or it will just pull air thru the threads. But be careful to not get the tape on the taper, just the treads!

It worked so well on his bike I re-bled the fronts on my VF700, I had just rebuilt them a few months ago. I got some bubbles out of the system and the lever feels more solid than before and I thought it felt really good already!

I kept the pump for now and I'm about to rebuild the clutch and rear brake systems and use it to refill them.