Topic: Runing CR carbs on stock K6 Update:They work regardless of skepticism and now...

[Supermex01]

My carbs are sticking and haved a small fracture on one carb by the main jet inlet.
I think its time to replace.
Before I get them I want to get your opinions.
I'm at sea level dyna ignition 5ohms coils open exhaust.
Is there a jet for each circuit?
If so what's recomendations on jets?
Anything I should ask before getting?
I'm thinking 29"
 

[lucky]

I hope you do not throw that set of carbs away.
many people need those hard to get parts.

IF you are going with NEW carbs why not check into duel Mikuni's from Cycle-X?

There is also the 1-4 manifold and single NEW carb set  pre jetted.
Gary nelson Racing Products. Comes with Mikuni 38mm Carburetor.
https://www.garynelsonracing.com/products.html

[Don R]

ooh, CR's I missed buying a set last year, boo on me.

[bollingball]

I think this is all over kill way over IF you have a stock motor. What have you done to the bottom end to require this? What kind of head work?
Ken

[brandEn]

Yup important questions for sure. Is the motor stock or modified. If its stock stick with the factory carbs.

[Supermex01]

My carbs are sticking and haved a small fracture on one carb by the main jet inlet.
I think its time to replace.
No engine mods (yet)

[harisuluv]

People who get CR carbs for non racing type bikes usually just plain want CR carbs.  Whether that be for the look, or the coolness factor, or wanting to buy something "new" because it will supposedly work perfect since it's brand new.  They might rationalize it this way or that, but in the end, they just want those CRs. 

I'm just making a generalization, in no way reflects on the op!

[Supermex01]

My carbs are sticking and haved a small fracture on one carb by the main jet inlet.
I think its time to replace.
No engine mods (yet)

[bollingball]

People who get CR carbs for non racing type bikes usually just plain want CR carbs.  Whether that be for the look, or the coolness factor, or wanting to buy something "new" because it will supposedly work perfect since it's brand new.  They might rationalize it this way or that, but in the end, they just want those CRs. 

I'm just making a generalization, in no way reflects on the op!

This pretty much sums it up. I'm poor and jealous as hell
Ken

[bjbuchanan]

You can keep repeating that same post but it still isn't gonna help anything.

Why don't you contact Harisluv or any of us (me included) who have some random carb bodies laying around that could fix you up. Sticking slides mean you need to clean it up, that is about it

If you don't want to get dirty cleaning up your carbs and replacing the one body then I really don't see you tuning those CR's, which will require plenty of work because of all the choices and different circuits

A carb body is like 40, carb cleaner is 3.99 a can and your hard work is free. Why don't you post up your carb numbers. Unless you considerably work over your engine you have no use of them.

[Supermex01]

It's not that I don't want to work on them
I restored the bike my self.
A piston on carb # 2 is sticking because part on the carb body where the piston sets is binding with it.
The fracture is on carb number 4
By the time I'm done fixing that I could just buy new carbs
Don't want any issues with you guys I'm looking for good advice.
I would prefer individual setting for all circuits as it will make for a better running.
Please don't assume stuff with out knowing

[andrewk]

Cycle-x dual Mikuni setup won't fit a stock frame, FWIW.  You can physically get them in there, but the intake path is fooked.  Can't run air filters, probably have to trim down the cheap stacks they come with.  Not a good idea, and not recommended by Cycle-X.  Again, just FWIW.

There's also the Mikuni RS setup that is about the same money as a set of CR's.  But, they're pretty big (34mm!) and on a stock engine, that's probably a real torque killer.

29mm is probably too big too, I think you're probably dipping into mostly uncharted waters here.  Maybe adapt some CR 26's?

[madScientist]

I would see if you can get a rebuildable set of stock carbs off of ebay for now. You're going to be saving some pretty big coin and then you can use that money you saved to start saving for the performance upgrades. Plus you will most likely get your money back out of those carbs when you're ready to step up to bigger ones.

Get some head work, new cam, and a big bore kit done and then move up to CR's or RS's.

At this point you're not going to get any advantage to stepping to CR29's and all you're really going to accomplish is killing your fuel mileage, torque, and introduce frustration trying to get the A/F right. Just my $.02...

[78whiteorbs]

Neat trick with cracked or corroded carb jet towers is get some spent .45 caliber casings and dremel off the caps. Tap 'em down and viola~ Like "crown" for your pour jet towers. Works perfect, I have saved a few cheap and easily!
I have some casings if you need some!

[bjbuchanan]

It's not that I don't want to work on them
I restored the bike my self.
A piston on carb # 2 is sticking because part on the carb body where the piston sets is binding with it.

Make sure the cutout on the slide is aligned with the little tab in the throat/travel area. Any varnish built up in there will cause sticking, not much else in there to mess stuff up/make it bind. Make sure the actual thin rod that connects to the piston isn't bent. It will make the set bind up
The fracture is on carb number 4

Tell us the carb number and I bet one of us have a good one laying around for 40$ negotiable

By the time I'm done fixing that I could just buy new carbs

A rack of CR's alone are like 700, not to mention the additional cost of the tuning parts like jets and whatever you decide to use as manifolds to mount them

Don't want any issues with you guys I'm looking for good advice.
I would prefer individual setting for all circuits as it will make for a better running.
Please don't assume stuff with out knowing

I want your bike to run as well as you do, I'm just thinking that for the cost of a body and carb kit (about 120$ all in) you could get it running well and get to ride

[harisuluv]

People are just trying to give you some feedback, truth is that you will probably have more trouble with the CRs as far as set up and tuning than if you fixed yours yourself.

That being said I myself can't offer any advice on which ones to buy or tuning.  Best of luck!

[Supermex01]

Well it's something to be said about 30 year old carbs
They've been cleaned and service over and over again
The very fine tolerances, holes etc are not consistent any more
Unless the carbs are new they will never run as good as they need too.
I can't get the bike to rev slower than 25k rpm
So it's hard to idle and hard to tune.
For me time is more valuable than money as I will never get that back
I just order the CR 29 carbs
But my original question is:
What will be an appropriate jetting for it?

[bjbuchanan]

Little sidebar: that high rpm is probably a sticky mechanical advance or weak mech. advance springs. It gets forgotten behind the timing plate and ends up driving people crazy til they stumble upon it by fixing literally everything else

[bollingball]

Little sidebar: that high rpm is probably a sticky mechanical advance or weak mech. advance springs. It gets forgotten behind the timing plate and ends up driving people crazy til they stumble upon it by fixing literally everything else

But still 25K
Super looked at some of your past post bike looks good will the CRs use the same intake rubbers and what are you planning for filter system it would be sad to cover them things up as much as I like the stock air box. How about some gold anodized stacks
 Keep us posted on how you set it all up. I don't have a clue.
Ken

[Retro Rocket]

Well it's something to be said about 30 year old carbs
They've been cleaned and service over and over again
The very fine tolerances, holes etc are not consistent any more
Unless the carbs are new they will never run as good as they need too.
I can't get the bike to rev slower than 25k rpm
So it's hard to idle and hard to tune.
For me time is more valuable than money as I will never get that back
I just order the CR 29 carbs
But my original question is:
What will be an appropriate jetting for it?

You are going to hate the CR's on a stock engine, your idle and cold starting will p1ss you off, CR's are a race carb and designed for middle to full throttle applications, complete overkill on a stock engine, as someone else said, stock carbs until you work the engine, not the other way around.  Another point, a lot of the guys here that have CR's have access to a dyno and don't pay what you will for the time needed to tune them properly... On your stock engined bike the CR's will be

hard to idle and hard to tune.

.
Use a good set of stock carbs until you do your engine work, then sell them, there's always someone here looking for a good set of stock carbs..  Appropriate jetting is impossible to say, i don't know anyone running them on a stock engine for the reasons mentioned, besides, all bikes will have a slightly different tune depending on specs and engine wear, if you plan on using HIPO parts then you should know this. Any specs given will only be a base line starting point, you will still have to have the correct needles and jets to suit YOUR application.......

[bollingball]

Some times the hard expensive lessons are the ones you never forget. But if the man has made up his mind we ought to try to help. If you ever build your motor then you still have the carbs. A couple of years ago everyone was trying them and they were hard to find. Keep all the packing if you don't get them to work you will get a good chunk of your money back.
Good luck and keep us posted. I would at the very least send the head out to Mreick.
Ken

[Retro Rocket]

The way i see it Ken is that some people ask for help but have already made up their minds, wanting comformation that they have "done the right thing" what i posted was help because i don't think he is doing the right thing at this point in time. Most people don't realize that setting up carbs is not that simple if you have never done it before or don't have access to a dyno to make it easier. Making statements like "Unless the carbs are new they will never run as good as they need too." shows to me that he doesn't know a great deal about carbs because that is plain wrong.... Anyway, i don't really care what he does, at least now when he finds out that the CR's are a pain in the arse to set up on his stock bike he can't b1tch...

[bollingball]

The way i see it Ken is that some people ask for help but have already made up their minds, wanting comformation that they have "done the right thing" what i posted was help because i don't think he is doing the right thing at this point in time. Most people don't realize that setting up carbs is not that simple if you have never done it before or don't have access to a dyno to make it easier. Making statements like "Unless the carbs are new they will never run as good as they need too." shows to me that he doesn't know a great deal about carbs because that is plain wrong.... Anyway, i don't really care what he does, at least now when he finds out that the CR's are a pain in the arse to set up on his stock bike he can't b1tch...

I agree completely Retro He will understand later like you said he has made up his mind

[Supermex01]

I do have access to a dyno
Ill be looking into the ignition advance for sticky spring
This was a good suggestion

[Lostboy Steve]

I hope you do not throw that set of carbs away.
many people need those hard to get parts.

IF you are going with NEW carbs why not check into duel Mikuni's from Cycle-X?

There is also the 1-4 manifold and single NEW carb set  pre jetted.
Gary nelson Racing Products. Comes with Mikuni 38mm Carburetor.
https://www.garynelsonracing.com/products.html

...How does that single setup perform? Very Interesting.