Hi there,i've got Keihin CV carburatores on my super four '93(I'm pretty sure that CBR carbs are similar type,that's why i posted my question here too) and just can't get proper mixture from them.Even if i remove the air filter still there's a black smoke when i rev from the exhaust .the fuel consumption is about 10l/100km... .The carbs are perfectly cleaned,with proper jets,fuel level is ok and at the moment i blame jet needles for my problem.The thing is they haven't got settings ...is that so? There are washers that i've removed(moved the jet needles little bit down) and the engine feels better since than.
I doubt if the jet needles are original.In every jet needles kit for keihin that i've checked there are several positions in leveling the needle(not with mine).The bike is Japan import and i just can't be sure about anything.
You may say to buy some needles and try,but don't know what to order.There are hundreds numbers of needles and none of them has close sizes(may be i just couldn't find my model by now).And the other thing is i live in Bulgaria and it's not easy to order things from here .ANY IDEAS?ANY..???

P.S
I'm pretty sure about engine condition-the compression ratio is between 12 and 13....

kiki5 wrote:I doubt if the jet needles are original.In every jet needles kit for keihin that i've checked there are several positions in leveling the needle(not with mine).

The standard keihin needles aren't adjustable, yours could be standard. What sized pilot jets and main jets are you using?

Are you sure the engine is in good condition??

Main jet for 1st and 4th carb-95,second and third -98.Pilot jets are 35.
And about engine condition i did the compression test and the result is between 12-13atm.do you think that's enough?

Problem was electrical...it was regulator-rectifier.I've put now dominator's one.It was the closest i could find like the generator coil resistance.Let's see...