xr1200 thottlebody on xb heads (does it fit?!)

[aswracing]

Originally Posted by Jens L

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.

[aswracing]

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.