Last visit was: Sat Jun 06, 2020 2:35 am It is currently Sat Jun 06, 2020 2:35 am

All times are UTC+01:00




 [ 6 posts ] 
Author Message
PostPosted: Tue May 19, 2020 10:33 pm 
Offline
User avatar

Joined: Mon Jul 15, 2019 10:43 pm
Posts: 116
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.


You do not have the required permissions to view the files attached to this post.

_________________
Buell S1 Lightning
Triumph Rocket3
Suzuki GT750
Kawasaki H1B
Honda 400 Four
Kawasaki Z1300 ( current project)


Top
   
 
PostPosted: Wed May 20, 2020 2:37 am 
Offline
User avatar

Joined: Wed Apr 29, 2009 7:27 pm
Posts: 837
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

_________________
Try doing this to yer fueller...........


Top
   
 
PostPosted: Wed May 20, 2020 6:11 am 
Offline
User avatar

Joined: Mon Jul 15, 2019 10:43 pm
Posts: 116
Current ride: Buell S1 Lightning
Location: Glasgow, Scotland
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.

_________________
Buell S1 Lightning
Triumph Rocket3
Suzuki GT750
Kawasaki H1B
Honda 400 Four
Kawasaki Z1300 ( current project)


Top
   
 
PostPosted: Wed May 20, 2020 8:21 am 
Offline
User avatar

Joined: Wed Apr 29, 2009 7:27 pm
Posts: 837
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.

_________________
Try doing this to yer fueller...........


Top
   
 
PostPosted: Wed May 20, 2020 8:50 am 
Offline
User avatar

Joined: Fri May 22, 2009 6:43 pm
Posts: 2689
Current ride: S1`s
Location: Llanelli South Wales
I read that as you`ll need a wider manifold and different flanges .


Top
   
 
PostPosted: Wed May 20, 2020 11:28 am 
Offline
User avatar

Joined: Mon Jul 15, 2019 10:43 pm
Posts: 116
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.

_________________
Buell S1 Lightning
Triumph Rocket3
Suzuki GT750
Kawasaki H1B
Honda 400 Four
Kawasaki Z1300 ( current project)


Top
   
 
 [ 6 posts ] 

All times are UTC+01:00


Who is online

Users browsing this forum: CommonCrawl [Bot], thom_1991 and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Limited