Topic: Question for experts

[lucky]

I am about to take the carbs off of my CB750K 1978. It is running perfect but I just do not like the carbs.
I was going to put my 1969 carbs on instead. I like how easy they are to tune. Like changing needles etc.,.

Is there anything I should know before I bark up the wrong tree?


Right now i have the 78 carbs.
non adjustable needle.
#120 main jets.
#42 idle jets.
Mixture screw out 1 turn.
Cycle-X 4 into 2 into 1 exhaust.
Stock intake and stock air filter.

Good throttle response ,starts easy .
Plugs look right.
In top gear it will just keep accelerating no problem.

[CycleRanger]

 

[lucky]

Is that some kind of !@@#!$!%#$ answer?
You are too high and mighty to answer or you just have never worked with the early style carbs?

Here this is for you

[CBJoe]

Is that some kind of !@@#!$!%#$ answer?
You are too high and mighty to answer or you just have never worked with the early style carbs?

Here this is for you

I think in general it was a satirical ideal associated with asking for general carb jetting advice in the Hi-Po area. 

But maybe I shouldn't answer this as I'm likely no more educated than you are on CB750 Carb stuffs...

Or we could discuss the existential existence of the smiley-face eye roll.... but maybe not as I don't seem to be able to keep my bikes running.  So in the end this is probably all my fault. Not...


Cheers, Joe
 

[lucky]

I was asking this question on this forum because I do NOT need general jetting information.. I can already do that myself.

I thought that the people on this forum had RACING experience and one of you may have even used the 1969 carbs on a later model. I wanted to know your experience.
Last week I came across a thread where a guy bough a drag racing 1978 CB750 that did have CB750 1969 carbs already on it. But that guy knew nothing and was changing out all the great parts on that bike.

I guess none of you know. thats all.

[scottly]

I am about to take the carbs off of my CB750K 1978. It is running perfect but I just do not like the carbs.

If it is running perfect, then you are done with tuning anyway. Why are you taking a step backward? As far as asking the experts, if you don't know what you are talking about, please refrain in the future from giving out erroneous advice on tuning, trouble-shooting, and terminology as you have done so many times in the past...
You built a nice looking bike, BTW.

[Stev-o]

I'm no expert but the last thing I would ever do to my K8 is change the carbs!  Two flicks of the throttle, pull on the choke, push the button and it starts right up every time.
Don't care for the cable choke control, though, lever is better.

[Sam Green Racing]

Let's try to keep it nice gentlemen
lucky posted in the wrong forum and worded the title wrong.
Perhaps had he asked for someone who had done this before and were there any pitfalls, it might have been clearer.
My own take on this is, (not an expert) why bother about notches on a needle when the weather can cause the jetting to be out by as much as a couple of jet sizes at any time of the day? One just needs to find the sweet spot in the carburration which it seems like lucky has already done.

Sam.

[lucky]

Here is something you may have been able to tell me.
The 1978 Rubber mount boots fit the 1969 carbs.
They were about .060 loose but I did the simple thing and just tightened up the boot. It worked!


Perhaps one of you knew that already and could have advised me.
I do like not having a choke cable.
I can change the jets now and the needles without even taking the carbs off!

I will see how they perform.

[lucky]

I'm no expert but the last thing I would ever do to my K8 is change the carbs!  Two flicks of the throttle, pull on the choke, push the button and it starts right up every time.
Don't care for the cable choke control, though, lever is better.

I am glad you like your K8 carbs Steve-O.