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lagerdrinker
19th July 2006, 15:32
going to get baseline runs. wish me big numbers:D

cgp-1200R
19th July 2006, 15:38
Got everything crossed.... BIG NUMBERS.

BlueHen
19th July 2006, 16:27
Here's to big numbers man :drinkbeer :cheers :drinkbeer

C Dubya
19th July 2006, 16:27
going to get baseline runs. wish me big numbers:D

Hey lager,

Have you done anything aside from the 1250 kit?

chrishajer
19th July 2006, 16:42
I am predicting 38 HP, and 96 ft lbs of torque!

Good luck :laugh

--Chris

lagerdrinker
19th July 2006, 16:57
I am predicting 38 HP, and 96 ft lbs of torque!

Good luck :laugh

--Chris


hahaha
close...75.4 ftlbs and 63.8hp
torque peaks at around 3600rpm
hp flattens out at 4000 rpm and peaks at 6000.

they didnt have a sniffer so no a/f but watching run tells me its running a bit on the rich side. the way the hp flattens, i think i need bigger valves.
still happy with what it did. ill add a pic in gallery in a moment as i still am computer dumb.

chrishajer
19th July 2006, 16:59
Pic, pic!

Flattens out at 4000 doesn't sound good :(

--Chris

lagerdrinker
19th July 2006, 17:06
ok, added pic but its fuzzy. ill try for a bit clearer.

chrishajer
19th July 2006, 17:16
Based on that, your top end power is dying because the valves are too small. Are you still using 883 heads and valves? High velocity, good torque, low top end power because there's no more air flow.

--Chris

lagerdrinker
19th July 2006, 17:20
Based on that, your top end power is dying because the valves are too small. Are you still using 883 heads and valves? High velocity, good torque, low top end power because there's no more air flow.

--Chris

yeah, thats what i figured. still stock heads and valves on bike. honestly im happy, hell 25hp increase and 25ftlb torque increase over stock for around 1100 bucks is pretty good i think. wait till i do stage 2 heads.

Shamdog
19th July 2006, 17:27
Large - Why not just have NRHS do their new, super secret, "Custom Valve Job"? It should get you over 80 hp, keep the reves low, and only costs $250 if I remember right!!!

chrishajer
19th July 2006, 17:29
It's a good result, torque where you want it. I'd be happy too. Plus, ya got a patch, three of them! It's a good week.

--Chris

lagerdrinker
19th July 2006, 17:37
It's a good result, torque where you want it. I'd be happy too. Plus, ya got a patch, three of them! It's a good week.

--Chris

its been a great week for me and its not over yet. this weekend is the big swap/show at carlisle. used heads are on my list of things to look for.
plus the guys at the harley dealer may have a set of trick heads they might have for sale, not holding my breath on it but it would be nice.

lagerdrinker
19th July 2006, 17:39
Large - Why not just have NRHS do their new, super secret, "Custom Valve Job"? It should get you over 80 hp, keep the reves low, and only costs $250 if I remember right!!!

actually i want more top end as i spend more time up in the revs. im platueaing around 4000 rpms, wanna raise it a bit.

Shamdog
19th July 2006, 17:47
Use the .536 cams. They kick ass above 3500 RPMs.

lagerdrinker
20th July 2006, 01:53
Use the .536 cams. They kick ass above 3500 RPMs.
cant change anything until i have heads that can support more airflow.

lagerdrinker
20th July 2006, 01:56
Hey lager,

Have you done anything aside from the 1250 kit?

have nrhs iron 1250 with se bolt in cams(497). stock 2-1 exhaust pipe with v-h muffler se ac.

rottenralph
20th July 2006, 02:19
I ported my own 883 heads and had 73.81/78.31 h.p./tq on my recent trip to the dyno. My cams are n8's. I suspect a little porting might help. It is not as high as I hoped. I wanted 80/80 but I suppose the I can be happy because my butt dyno likes the feel.

lagerdrinker
20th July 2006, 02:26
I ported my own 883 heads and had 73.81/78.31 h.p./tq on my recent trip to the dyno. My cams are n8's. I suspect a little porting might help. It is not as high as I hoped. I wanted 80/80 but I suppose the I can be happy because my butt dyno likes the feel.

ive been following your threads and may try my hand at porting my own.
to be quite honest, i like my bike the way it is and dont need anything more. But looking at my dyno run tells me i have alot of potential at the top end which is going to waste if i leave it alone.

rottenralph
20th July 2006, 02:29
It cost me 30 dollars for the rowe valves. 10 hours with a dremel tool and about 40 dollars worth of bits. I have great pics of ports if you need them.

lagerdrinker
20th July 2006, 02:36
It cost me 30 dollars for the rowe valves. 10 hours with a dremel tool and about 40 dollars worth of bits. I have great pics of ports if you need them.


lol, aleady saved in computer from your post. also found more on my own. thanks

MOREHP
20th July 2006, 02:55
I just took my Xb heads off and sent them NRHS to get stage 2 done on them and also a 1250 kit. I put on my old stock 1200 heads so I wont lose three weeks of prime riding. And what a difference compared to the stock XB heads, it runs like shit. If you get a chance to pick up a set of stock 04-up sportster heads or stock XB heads do it. The difference is like night and day.

lagerdrinker
20th July 2006, 17:00
with any 1200 heads ill need to send out pistons to get valve pockets cut deaper correct?

rottenralph
20th July 2006, 19:08
I had 1200 heads on mine before with the same pistons i'm using now.

MOREHP
20th July 2006, 19:17
I have stock flat top 1200 pistons,works great with xb heads.

Jimbos883
20th July 2006, 19:25
lagerdrinker I've been reading this thread and I think Shamdog has offered the best solution for you. Have NRHS do thier new 883 head porting to your stock heads. My understanding of your bike is that it just had the NRHS 1250 kit installed nothing else. Reason I agree with him is if you go to 1200 heads I'm pretty sure your 1250 kit had dished pistons in it, when used with 883 heads, and when paired with the 1200 combustion chambers you'll wind up with a lower compression ratio.

If you want the 1200 heads I'm pretty sure that you'll have to change out your current pistons to keep the compression up, which would mean new rings and rebore/hone . I maybe wrong and if I am I hope that someone will lead me in the right path.

lagerdrinker
20th July 2006, 19:30
If you want the 1200 heads I'm pretty sure that you'll have to change out your current pistons to keep the compression up, which would mean new rings and rebore/hone . I maybe wrong and if I am I hope that someone will lead me in the right path.


i think you may be right, just for good measure i posted in nrhs forum. they should know what works with thier kits.

MOREHP
20th July 2006, 19:34
If you want the 1200 heads I'm pretty sure that you'll have to change out your current pistons to keep the compression up, which would mean new rings and rebore/hone . I maybe wrong and if I am I hope that someone will lead me in the right path.[/QUOTE]


Jimbos right, If you have dished pistons you would have to change them to flat tops to keep the compression up. Get a set off of 883 heads off ebay they are a dime a dozen there and you will lose no riding time.