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Converting the XT to a single carb setup, possible? Converting the XT to a single carb setup, possible?
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 9 Jul 2010
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Converting the XT to a single carb setup, possible?
is it possible, without extensive modification to put a single carb on an XT600? or better yet, is there a set of traditional CV carbs that can be directly bolted on in place of the setup I have?

I dont much care for the design of the current carbs, but beyond those, this bike is GREAT to me.
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Old 9 Jul 2010
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I’m curious, why don’t you like the stock carbs?

I recall reading somewhere about a guy trying to make the carburetors from a Kawasaki ninja 250 work. I don’t remember if the post was here or somewhere else. Maybe you can bing/google it. There ninja has two carbs (not one) but the design is really simple.

The little ninja was a huge seller for years, carburetors should be easy to find and cheap.
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Old 9 Jul 2010
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I "binged" and found this:

Quote:
fuelbender
06-30-2005, 04:06 PM

If you are really set on replacing your carbs then you can use ninja250 carbs; srx guys have used them with success. The early ones (i forgot which years) are bigger than the later ones. The carb spacing is an exact match, and fit on the stock manifolds. Either one has more open area than the stocker(more flow) and almost every junkyard has a few cheap. You gotta re-jet though.
tt600 carbs - ThumperTalk
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Old 9 Jul 2010
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I looked at the 250's carbs, nd thought about that, if I'm not mistaken they're a smaller bore though, which would detract power.

what I was looking at, and considering is XT660 or Raptor carbs, since its a VERY similar motor, and I'm 99% sure the spacing is the same. from the looks of things, they my even pop righ into my current intake manifold easily.


the stock carbs on my 84, are well, to me just not well designed. I DO NOT like having a CV and slide carb combo. especially not with how its designed.

newer regular CV carbs just seem much better. those I actually know how to tune easily.
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Old 10 Jul 2010
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bob i fitted ccm carbs to mine the spacing is pretty close and does need a slight bit of tweeking but they make a hell of a difference.
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Old 10 Jul 2010
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ccm? could you provide me a little more info on those please?
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Old 10 Jul 2010
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ccm or freewind carbs basicly the suzuki engined ccm carbs are the best as they are bigger jets for a start off so are a straight swap jetting wise and its the stubb rubbers that need a bit of a tweek to get them to seal properly.
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Old 10 Jul 2010
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How much gain in performance is there in fitting those ccm carbs?......cheers
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Old 10 Jul 2010
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I didnt see a single carb conversion, although I did see a dual Mikuni setup, which I may think about. I bet I could make a set of GS500 carburetors do the job if I tried, which isnt hard really.
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Old 10 Jul 2010
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keny its not a huge increase in power its more about how it delivers it the motor is more responsive throughout the rev range and gives it a bit more at the top end where the old carb just seemed to be at its limits


bob the ccm carbs are a dual Mikuni bsr32's setup which means they are both slightly bigger than the larger bore of the standard carb
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Old 10 Jul 2010
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I've also heard that the 660 Grizzly 2into1 manifold & carb is a straight swap....
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Old 10 Jul 2010
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You guys.... how about searching?

It's here, look:



1 - My very own 1990 XT600E engine
2 - Mikuni BST40 single carburetor
3 - Grizzly 660 JOINT, CARBURETOR part number: 5KM-13596-00-00

Yes, it's possible.
As far as the extensive modification I'll try to put a picture here when I get back home in two weeks.

Vando
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Old 10 Jul 2010
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Quote:
Originally Posted by YamaHead View Post
I've also heard that the 660 Grizzly 2into1 manifold & carb is a straight swap....
yes it will bolt straight on but the grizzly manifold is straight and does not have the rear shock in the way so there is a major issue with clearances you need a manifold that is angled so you can fit the carb at 45 degrees to the engine like the DR's single carb set up
what you probably cant see clearly in vando's pic is the rear shock is at least 3" from where it should be so its compromised all the suspention geometry
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Old 10 Jul 2010
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Yup, Wolf is right and I was too thickheaded thinking I could solve anything..

Even with the angled manifold you'll probably gonna have a problem with the throttle cables' orientation unless you figure out something engineous to make them able to work well I guess...

Anyway, my bike geometry didn't change that much because of the YZ front suspension.

But still, It's up to ya
Hope you make it work!


Vando
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Old 11 Jul 2010
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the throtle cable should be fine as there is plenty of flex in it.

btw suspension height and geometry are two seperate things the more vertical the rear shock is to the pivot point of the swingarm has an affect on the preload aswell as the response of the damper, ok we are talking about the soft suspention on an off road bike not a race bike but it should not be dismissed easily.
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