1980 Honda CB750K Idle problem?

Not sure I will be of any help, but you have to know this is the exact

reason the bike was up for sale, it is gonna be a tricky one to fix,

unless you get the right person to help you conquer the problem.

Have u taken it by a local mechanic close to you to get some help,

you need to get it fixed before you are sitting on the curb or pushing

it down the road. Several links came up as I brought up your

question, I hope you find all the right answers, and get it fixed real

soon, take care.

1980 Honda Cb750k

Did you try setting your idle knob down? Did someone syncronize the carbs? If that's not it, the carbs may have to be taken back apart and more carefully cleaned by an expert who USES CARB WIRES. That can make the difference. You could also have weak compression on a cylinder.

1980 Cb750k

I had the same problem. You need to sync your carbs. In my case one cyl was running fast and would drag the other three up with it. If you check your manifold temps you may be able to isolate the problem cyl and fix by trial and error.. A carb sync is the best but very difficult to do if you are inexperienced.

The engine will not idle properly unless it has the stock air box and air filter.

The idle screw is #5 bottom of the carbs. It has a large plastic knob.

http://www.powersportspro.com/pages/OemParts?aribr...

Carb wires are assorted gauges of wire, to poke through and clean jets.

See Jet Cleaning Tool

http://www.powersportrider.com/CGI-BIN/ZCATJPG?cat...

verify the rubber manifolds to each and each carb on the motorcycle. you've one set it quite is the carb to engine and one set it quite is the airbox to diminish back of the carb. all of them prefer to be delicate rubber-no longer not uncomplicated and non pliable. once you've solid rubber on all 4 carbs, then make positive the clamps protecting the mainfolds onto the carb are solid n tight without leaks of air getting round them. commence the motorcycle and then spray some wd40 on the aspects of the clamps protecting the carbs, if the engine idle will boost, the seal is undesirable on that cylinder. As I undergo in thoughts on the carb to engine area of the manifold, the position the maifold connects to the engine there's a rubber o ring lower than there, take a inspect that o ring and make positive that's delicate and pliable, no longer not uncomplicated and rigid. even if that's (not uncomplicated), replace it. you opt for a guide for the motorcycle. that's going to allow you to comprehend if there is any screwy jet formation contained in the carbs-like carb a million has a one hundred and 5 jet notwithstanding the others all have 100 mains (or some thing simular). Then flow via the carbs, cleansing the jets and searching on the numbers stamped into each and each jet making positive they are wonderful for that carb. finally on the commercial company of carbs you should work out a screw down between carbs a million&2 and yet another between 2&3 and finally the in basic terms suitable one down between 3&4. those are your syncronising screws. You regulate each and each pair to at least one yet another (you opt for a manometer) and then finally regulate each and each set to the different, so that you regulate carbs a million&2 to at least one yet another, then carbs 3&4 to at least one yet another and finally you regulate both instruments to at least one yet another through the screw between 2&3. The guide for the motorcycle will practice you in images precisely the thanks to do it.