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PostPosted: 19 May 2020 22:33 
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Joined: 15 Jul 2019 22:43
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Current ride: Buell S1 Lightning
Location: Glasgow, Scotland
I have the chance of a couple of XB heads for my S1, but I am not sure if they will fit, I suspect they may be off a later fuel injected Sportster. The part numbers are Front 16874-07 and rear 16877-07, they are silver and the carb mounts are drilled and tapped, also he has a couple of flanges with it which may or may not be something to do with mounting the intake manifold, any info on whether these would fit my bike or if any other parts would be required would be very helpful, Thanks in advance.


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PostPosted: 20 May 2020 02:37 
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Yes, they will fit. For >07 model year, I believe the faces where the inlet manifold fits were machined further back. That's from memory. This is what Hammer Performance say -

07-Present XL1200 Heads

62cc chamber, 1.810" diameter intake valves, 1.575" diameter exhaust valves

The 2007-Present (EFI) XL1200 heads are identical to the 2004-2006 version except for the following items:

HD made a small change to the floor of the intake port. The change actually makes the flow through this port slightly less laminar than the 2004-2006 head. It's not an enormous difference, but in stock form this head is capable of supporting a few horsepower less.

These heads are available in straight black as well as black with highlighted fins. They are not available in silver, use the XB heads if you need silver.

HD made a couple changes to the surface where the manifold attaches, to accommodate the EFI throttle body. This area is now machined down 1/16 of an inch (.0625") as compared to all previous carb type heads and XB heads. If you're using 2007 or later heads with a carburetor, you'll want a wider manifold, which HAMMER PERFORMANCE offers here. Some people have made it work with a regular carb type manifold with careful centering, but more often than not, it causes issues with the engine sucking the seals in.

The other big change to the manifold area that HD made was to widen the bolt pattern. This is really nice as it makes the access to the bolts much easier, allowing the use of standard hex head bolts. But it means you'll need the new flanges to match. HAMMER PERFORMANCE offers these new flanges here, and they are not expensive.

A version of the Screamin Eagle head is available that's based on this head as well. It has all the downsides of the 2004-2006 version. and therefore we do not recommend it.

Original text here -

http://hammerperf.com/ttxlheads.shtml

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PostPosted: 20 May 2020 06:11 
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Joined: 15 Jul 2019 22:43
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Current ride: Buell S1 Lightning
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Hello Thanks , I read that same article, Im assuming thats what the 2 flanges that come with the heads are for to take up the space where the machining is different, and the wider bolt hole pitch, if the 1/16 of an inch causes the problems they say Im wondering if 2 shims could be fitted between the head and the intake , if anyone else has any info or if they have fitted these later heads.

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PostPosted: 20 May 2020 08:21 
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You need to ensure the manifold seals don't get sucked into the manifold or inlet port. There's good advice on that Hammer Performance page. HTH.

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PostPosted: 20 May 2020 08:50 
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Joined: 22 May 2009 18:43
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I read that as you`ll need a wider manifold and different flanges .


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PostPosted: 20 May 2020 11:28 
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Joined: 15 Jul 2019 22:43
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Current ride: Buell S1 Lightning
Location: Glasgow, Scotland
I found this article seems to explain it well. https://thunderpress.net/editorial/colu ... /03/08.htm It looks as if they would go on with a mod to the intake and a new billet mount would probably be a job for the winter in case any additional parts were needed to avoid downtime.

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Buell S1 Lightning
Triumph Rocket3
Suzuki GT750
Kawasaki H1B
Honda 400 Four
Royal Enfield Bullet Diesel.
Kawasaki Z1300 ( current project)


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