anyone run a single carb on multi-cylinder bikes?

P

ph!L

Been Around the Block
I'm just curious if anyone does it and if it works okay, i just wonder how it works on say a 71 cl350 ;D
Don't really know why it wouldnt work out but im sure you guys will chyme in with more educated opinions than mine. Thanks!
 
Personally, I think it would be a DIY nightmare. Maybe not impossible, but quite a challenge.

Why do you ask?
 
Check out it over here http://www.armbell.com/kz400/viewtopic.php?t=11987&mforum=kz400

Lots of good info on single carb swaps on KZ400-440, one member, Glen has lots of good info on it. There are many more posts on it than the link I posted so search a little and youl find what your after.
 
We're using a single carb on our Virago. We wanted a downdraft carb, so we went for a carburetor that came of a car (a Opel Kadet from the sixties to be exact). We got it running pretty easily. Still waiting on parts for the brakes, so we haven't ridden it yet.

IMG_4438.JPG


http://www.youtube.com/watch?v=m3-q7GnIN2Y
 
Geez and crow, miob, that thing looks wicked! Loving the cut-end pipes as well...be brilliant to go riding around on that.

Cheers - boingk
 
Your biggest issue would be fitting a manifold on a 350 to run a singel carb. As far as carbs, a Solex 1bbl from a VW (downdraft), or any vintage HD or Triumph carb would work with propper jetting. Once again though, haw are you going to fit a Y manifold on a 350? The frames in the way.
 
yeah i know that area is really tight, seems like it may be more trouble than it is worth for the time being. I have this vision of running the manifold around the center support of the frame and having the carb and the filter sitting where the battery box sits now. Maybe something to think about for the future.
 
Increasing the length of your intake that much is no good, I think. I could be wrong, and probobly am. Seems like the time/effort to benefit ratio is way off. Im kinda lazy sometimes though, so... ;)
 
I've never really seen one or looked into it, but what about the "CD" models? Any possibilities with those?
 
m357.5 said:
Check out it over here http://www.armbell.com/kz400/viewtopic.php?t=11987&mforum=kz400

Lots of good info on single carb swaps on KZ400-440, one member, Glen has lots of good info on it. There are many more posts on it than the link I posted so search a little and youl find what your after.
Click to expand...


Ahh, my other online home on the few occasions I'm not surfing DTT. 8)
 
A guys been using this carb (Strobel IIRC) on his 4 cylinder kz650 for a few years:

CarbB.jpg
 
Big R said:
I've never really seen one or looked into it, but what about the "CD" models? Any possibilities with those?
Click to expand...

CD175 (Ihave one) uses a single intake port head that splits inside the casting. Also no manifold to speak of, just a short (5-6mm) spacer. I'm sure I saw a single carb conversion on a Kawasaki? on here. The manifold was a Y with the leg turned 90 deg and the carb side on like a v twin.
 
I guess my question to play devils advocate is if you take a bike that was designed for a dual carb setup and put a single carb on it how do you adjust for little stuff.
my for instance is my tx650 the right cylinder is notorious for running hotter and the left I have different jets main and pilot to compensate for this. I am not motor police so I don't know that it will not work and run very well and you will never have any issues.
just one thing to think about.
 
Mortikan said:
I guess my question to play devils advocate is if you take a bike that was designed for a dual carb setup and put a single carb on it how do you adjust for little stuff.
my for instance is my tx650 the right cylinder is notorious for running hotter and the left I have different jets main and pilot to compensate for this. I am not motor police so I don't know that it will not work and run very well and you will never have any issues.
just one thing to think about.
Click to expand...

Good points... It would take a lot of the adjustability away. I know on VW drag cars a lot of guys run a custom manifold and a 4bbl. Its tits for when your going all out, but for everyday driving its no good. They do run a single carb for 4 cylinders stock though, but the first performance upgrade to one of those motors is to run a dual carb setup. Split the motor into two halves. Sorry for the rambling.... Thinking out loud.
 
great idea with the copper piping on that one big carb! And MIOB!!! that thing is nasty awesome!!! Would be sooo fun to rip round on!
 
designed for a dual carb setup and put a single carb on it how do you adjust for little stuff.
Click to expand...

I would have to agree. It's not clear to me how an SOHC 4 can run better on 1 carb with some kind of cobbled up manifold, that with 1 carb for each cylinder.
Other than the complete PITA of setting up 4 carbs, what is the advantage of a single?
 
Done correctly It would be an upgrade for sure... Balanced/equalized intake is just as important as a balanced/equalized exhaust. Think about it

Louie

P.s. Single plain intake
 
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