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Sportster Models 883, 883 Custom, 1200 Custom, 883L, 1200L, 1200S, 1200 Roadster, XR1200, and the Nightster.
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Old 11-03-2012, 01:03 PM
mrfikser mrfikser is offline
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Default 1200 valves in 883 heads????

I am asking because I have a 00 883 and I am looking into doing the 1250 kit from nhrs and
wondering if I can put 1200 valves in a 883 heads, and if it is worth it without changes cams and do i need to do piston work for valve clearance... will it run right...I had heard something somewhere that bigger valves in these bikes makes you loose bottom end (or something like that)...or anyone out there tried this mod.???
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Old 11-03-2012, 01:05 PM
John Harper John Harper is offline
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I think I'd just contact NRHS directly, I'm sure they know all about headwork.

John
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Old 11-03-2012, 03:07 PM
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Quote:
Originally Posted by John Harper View Post
I think I'd just contact NRHS directly, I'm sure they know all about headwork.

John
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Old 11-03-2012, 03:24 PM
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xFreebirdx xFreebirdx is offline
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I have stage 2 porting - 883 heads that were done @ NRHS....... I'm pretty sure they are bigger than 1200 valves.

Intake valve is 1.715, Exhaust Valve is 1.480

It runs right.

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Valve sizes are 1.715" intake and 1.480" exhaust in 88-03 1200XL heads. I guess they are the same size as a 1200's so the cams will help make up the difference.

DISCLAIMER: This information has NOT been verified and cannot be guaranteed to be accurate.
.
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Last edited by xFreebirdx; 11-04-2012 at 02:25 PM..
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Old 11-04-2012, 02:24 PM
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And there you have it.
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800 Open Mod 268hp (Rotax)
617 Mach1 on NOS (Rotax)
1996 D3500 V10 425hp 600+lbs tq.
1996 HD 1250 XLH "Custom" Stage 2 Heads, SE.497 Cams, SE Prog. Race Ignition.
A Tiger Doesn't Lose Sleep Over the Opinion of Sheep.
Vet: ★US ARMY 78 - 81★Patriot Guard Rider ID#45266 07/06/06★
1996 HD 1250 XLH
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Old 11-05-2012, 04:02 AM
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grbrown grbrown is offline
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Quote:
Originally Posted by mrfikser View Post
I am asking because I have a 00 883 and I am looking into doing the 1250 kit from nhrs and
wondering if I can put 1200 valves in a 883 heads, and if it is worth it without changes cams and do i need to do piston work for valve clearance... will it run right...I had heard something somewhere that bigger valves in these bikes makes you loose bottom end (or something like that)...or anyone out there tried this mod.???
If you take a look at NRHS's website you will see they offer several choices. You will get great performance with your stock 883 heads at the sort of engine speeds most of us ride at. Any head work will give most benefit at higher rpms and they offer three different stages of head work. One or more of those will have larger valves than your 883.

As you intend buying from him, phone Dan and ask his advice. I am sure he will talk through with you what each stage of headwork does and you can decide which one to go with.
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Old 11-05-2012, 03:35 PM
mrfikser mrfikser is offline
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Quote:
Originally Posted by NRHS View Post
with NRHS stage 2 headwork we install the Kibblewhite black diamond 1.715 Intake and 1.480 exhaust valves. These are not stock 1200 valves, they are custom conversion valves made just for 883 heads. 883s require a longer valve stem. If you used stock 1200 valves you would have very short installation heights which can cause valve spring coil bind.

Here is a dyno sheet showing the impact of our various stages of 883 headwork on a well build 1250 cc Sportster.

Click the image to open in full size.
ok, so no I can't .....I can do the work myself, do i need to cut the 1250 pistons with the bigger valves (that you sell)......and do I need to cut for bigger seats or can I just recut the original seats...also without a cam change will it run good at the bottom end....(00 883 )...what i am thinking, is to buy jugs, fitted pistons, valves, seats(??) , and guides...I already have a top end gasket set ....does that sound like it will work???
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Old 11-05-2012, 03:41 PM
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Originally Posted by mrfikser View Post
ok, so no I can't .....I can do the work myself, do i need to cut the 1250 pistons with the bigger valves (that you sell)......and do I need to cut for bigger seats or can I just recut the original seats...also without a cam change will it run good at the bottom end....(00 883 )...what i am thinking, is to buy jugs, fitted pistons, valves, seats(??) , and guides...I already have a top end gasket set ....does that sound like it will work???
Pick up the phone and talk things through with Dan, then let us know what you decide to go with. That will be much quicker and simpler!
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Old 11-05-2012, 03:48 PM
mrfikser mrfikser is offline
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yes, but the people who are interested to know will miss out!
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Old 11-06-2012, 05:53 AM
mrfikser mrfikser is offline
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so I spoke with Dan at nrhs and he said that I can put in bigger valves but not 1200 valves because they have shorter stems, also I don't need to replace the seats and that I can just recut the original seats for the bigger valves..but after talking for awhile we decided with the way I ride bigger valves prolly won't help much because
I don't ride in the hi rpms much and that is where big valves really help...so I decided to just go with a new cam and 1250 jugs and pistons...sounds like this is going to be a fun upgrade....thanks to Dan at NHRS for all the help...
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Old 11-06-2012, 05:53 AM
 
 
 
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