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  #11  
Old 29th November 2019
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aswracing aswracing is offline
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Originally Posted by Jens L View Post
Ok that makes sense and it could be real nice if you could messure it at some point, if i buy it before that i will text you with details.

when you say its wider, how much do you think approx. we are talking about ? do you think if i make litlle jig between the xb head space. that it would be possibly to cut weld and mill it to fit with som craftsmanship and the enjectors holes still being kept stock or are those maybe placed to wide ?
Y'know, I *think* we have an XR throttle body down at the shop. I'll be heading down there later for other reasons. If we have one, I'll measure it.

The XL's EFI manifold is 1/8" wider (.125") than a carb type manifold. This is because each manifold surface, on the heads, is milled down 1/16" as compared to carb type heads. XB heads are carb type heads, so they're not milled down like this.

We sell a carb manifold that's 1/8" wider than stock, for the express purpose of allowing EFI heads to be used with a carb.

In terms of adapting an XR manifold onto XB heads, far be it from me to say something can't be done. In fact, I'm sure it can be. But exactly what problems you'll have to solve, I'm not sure.
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  #12  
Old 29th November 2019
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Ok, I can confirm that the XR uses the same manifold width as an EFI XL. I measured port-to-port with a caliper at the closest place and got identical results.

We also have an XB manifold on the shelf, and it's 1/8" narrower, measured the same way.

Studying the Buell parts books, I can see that the XB manifold I measured is a 2003-2007 version, part number VINP0803.1AAA which is the 49mm version for an XB12. In 2008, the part number changes to VINP0803.5AA, which applies to 2008-2010 models (the last year Buells were made). I don't however have one of those manifolds on hand to measure. However, it's width could not have changed, because the part numbers for the heads remained the same. All 2003-2008 XB's use the same heads.

Then in 2009, the part numbers for the XB heads change. So the 2009-2010 XB heads are different from the 2003-2008. But the manifold doesn't change, so they couldn't have changed the spacing. I believe the change to the heads was cosmetic only. 2003-2008 XB heads are silver and 2009-2010 XB heads are black.

Bottom line here is the XR manifold/throttle body is going to be too wide to go in between XB heads.
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  #13  
Old 14th March 2020
Randy_rots Randy_rots is offline
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Buells never got the wider manifold spacing that was first introduced on EFI Sportsters in 2007. .
Yes they have That's why I was able to fit XR1200 heads successfully on my 2009 XB12 XT. Here are the XB 2008 & up P/N Rear: 16875-07A and front: 16872-07A.
These heads are using wider manifold flanges.
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Old 15th March 2020
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Yes they have That's why I was able to fit XR1200 heads successfully on my 2009 XB12 XT. Here are the XB 2008 & up P/N Rear: 16875-07A and front: 16872-07A.
These heads are using wider manifold flanges.
Wider manifold spacing and wider manifold flanges are two different things.
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  #15  
Old 15th March 2020
Randy_rots Randy_rots is offline
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Originally Posted by aswracing View Post
Wider manifold spacing and wider manifold flanges are two different things.
Maybe but I did not have any trouble to mount XB throttle body on XR1200 heads.
I sold my original heads but I have 2 brand new XB 08+ coming and I will take the measurements.
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  #16  
Old 15th March 2020
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Maybe but I did not have any trouble to mount XB throttle body on XR1200 heads.
I sold my original heads but I have 2 brand new XB 08+ coming and I will take the measurements.
Let me give the full story here, to give some context as to why the XB throttle body goes in between XR1200 heads.

Shortly after the EFI Sportsters came out in 2007, we noticed that a carb manifold didn't fit between EFI heads correctly, and some guys were having issues with the seals getting sucked in on decel when they used a carb with EFI heads.

There was some speculation here on the board that the angle of the manifold mating surface was different, but after making some measurements, we figured out that the angle was the same, but the surface had been milled down about 1/16", and the throttle body was 1/8" wider to match.

A change they made at the same time was the spread out manifold flanges, making the bolts much more accessible.

The Buell XB heads got the spread out manifold flanges at the same time. So there was some speculation that XB heads also got the manifold mating surfaces milled down.

We've made the measurements and we've found this is not the case. All XB heads are sized to use a carb-width type manifold. We've arrived at this conclusion after measuring heads and manifolds and throttle bodies. All the measurements point to the same conclusion: Buell XB heads didn't get their manifold mating surfaces milled down wider and don't use wide throttle bodies like the XL EFI bikes.

This conclusion is backed up by careful study of the parts books as well. For example, although the silver XB heads got a new part number in 2007 for the flange change, that new part number supersedes the old part number all the way back to the introduction of the XB in 2003. It also applies to silver head XB models in 2008. So it's the same head from 2003 through 2008 (you get two free flanges when you buy a set, by the way ... this allows them to be used as a service replacement on 2003-2006 XB's).

XB heads got a new part number in 2009, but that was for the color change to black. And the throttle body part number did not change between 2008 and 2009, which shows that the black heads retained the same manifold mating surfaces.

Anyway, the XR1200 heads, which came out in 2008, followed the XL heads. The mating surfaces are milled down 1/16" and the XR1200 throttle body is 1/8" wider than a carb type manifold to match.

So when you put an XB throttle body onto XR1200 heads, you're using a throttle body that's carb type width (i.e narrower) on heads that have their surfaces milled down 1/16" each (i.e. wider). So it fits in between the XR1200 heads with ease. You just have a bigger gap to the heads than ideal.

Watch the intake seals on decel, some guys have trouble with them getting sucked in when they put carb manifolds on EFI XL heads. It's the whole reason we came out with wider carb manifolds, so that guys can reliably use carbs with EFI heads.
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