NRHS 1250 kit
Ultimate HDF Member
Joined: Mar 2008
Posts: 7,604
Likes: 38
From: Landrum, SC , elevation 986'
you cant say that on here!
grumpy old men, who think they know everything, will appear and tell you are hallucinating, then they say there's no benefit to revving above 5000... springs..... and other incorrect bs. because that's what their bikes do, and we are all riding the EXACT SAME BIKE. then they'll say, " been riding/wrenching since dinosaurs were chasing motorcycles...." so they know it all.
that being said... don't make any attempt to cool your bike, increase perfomance, or enjoy cooled performance without their permission.
You still don't know **** about motors and should never give out advice like you do.............
No your just a focking idiot that blindly gives advice saying that it is OK to push stock valve springs to 7000 rpms. Even though all the aftermarket venders explicitly advise against it. Just because the dealer that sold you your stock Screaming Eagle 1200 kit said it was OK.
You still don't know **** about motors and should never give out advice like you do.............
You still don't know **** about motors and should never give out advice like you do.............
.i never, not once, told anyone to go to 7000. i also don't advise folks on major engine stuff. have no business doing it. i use "i" and often times call myself stupid.
angry old man
Last edited by cvaria; Dec 3, 2015 at 07:24 PM.
Road Captain
Joined: Mar 2009
Posts: 654
Likes: 734
This is a bone stock 2003 Buell XB9. It came from the factory with a 7500rpm rev limit as you can see.
Same exact springs, retainers, locks, valves, guides, pushrods, lifters, etc. as came stock on all 2004+ XL1200's. Failures were essentially unheard of.
However, the lobe profile of the "E" cams was a big part of how they pulled this off. This same hardware has been known to float and break retainers at 7000rpm when used with cams that have brutal lobes (N4's for example).
So it's not as simple as just the valve springs corresponding to some maximum safe rpm. The lobe profile has a huge amount to do with it.
Elite HDF Member
Joined: Aug 2011
Posts: 3,932
Likes: 45
From: Stockbridge GA
This is a bone stock 2003 Buell XB9. It came from the factory with a 7500rpm rev limit as you can see.
Same exact springs, retainers, locks, valves, guides, pushrods, lifters, etc. as came stock on all 2004+ XL1200's. Failures were essentially unheard of.
However, the lobe profile of the "E" cams was a big part of how they pulled this off. This same hardware has been known to float and break retainers at 7000rpm when used with cams that have brutal lobes (N4's for example).
So it's not as simple as just the valve springs corresponding to some maximum safe rpm. The lobe profile has a huge amount to do with it.
Dont come in here muddling **** up with facts
Road Warrior
Joined: Feb 2009
Posts: 1,727
Likes: 11
From: TN
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Times Harley-Davidson Chucked Tradition Out the Window
Verdad Gallardo
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
Looking at finally upgrading my '06 883R to a 1250. Is there anything else I ought to do while it's apart? I'm definitely going to put a Barnett clutch in it.
Head work?
Should I have a shop do it if I've never attempted such work before? I'm only moderately mechanically-inclined as it's not something I do often. Is the NRHS the way to go? Most of the threads I've read are at least a few years old so I'm not sure if anything has changed since.
Head work?
Should I have a shop do it if I've never attempted such work before? I'm only moderately mechanically-inclined as it's not something I do often. Is the NRHS the way to go? Most of the threads I've read are at least a few years old so I'm not sure if anything has changed since.
I'm very happy with my NRHS 1250 upgrade, as are a ton of our Customers.
See vid below-
What else to do when doing a 1250 upgrade?
You already know to do the clutch, lots of folks happy with the Barnett, I'm using the Energy One and am happy with it.
Might as well replace the umbrella valves in the rockers.
Install some Rocker Lockers.
Make sure to use a HiFlow air cleaner that has an external breather system. I don't believe you can do better than an Outlaw 636v.
Headwork will bring you more power, but at additional expense...depends on how much more power you're looking for, and if it is in your budget.
Regarding doing the work yourself. Our NRHS Kits come with step-by-step instructions, and if you are good at following them, it is a relatively simple job.
__________________
DKCustomProducts.com
DKCustomProducts.com
Last edited by DK Custom; Dec 4, 2015 at 02:21 AM.
