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  #1 (permalink)  
Old 01-13-2011, 07:23 PM
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Best option for a sportster 883 engine/ bore existing heads or buy 1200 upgrade kit?

Guys, just wondering what is the better way to go for durability and cost. Bore out the existing heads or buy the 1200 upgrade kit
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Old 01-13-2011, 07:49 PM
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you can bore the stock cylinders depending which piston set you buy you may not need any headwork at all. I use the Wisecos and they do not require any head work. The stock cylinders have plenty of heat and are reliable when bored to 1200.....

I have the Revolution 1250 kiys on my website but they are prolly 300 more than boring you cyls and buying a set of pistons
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Old 01-13-2011, 10:10 PM
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You will need the heads. Bore is going to open wider than 'the squish band proportion' right off. That's one. The other is a piston about to hit dome with more room needed. I believe both heads are different. You could probably get more money with a used head once it's time to recoup the 1200 head(s), you sort of buy the 1200 cheaper when you sell the 883's.

Once you gouge out that head sort of mickey mouse, it's not worth too much to anyone.
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Old 01-14-2011, 07:32 AM
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^^^ I'm with him.......buy the 1200 kit
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Old 01-14-2011, 01:41 PM
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NO repeat NO need to change your heads...As a matter of fact you will get better torque with the 883 heads...Any questions contact Dan at N.R.H.S.
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Old 01-14-2011, 04:47 PM
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Here's a 1200 kit with 883 heads. If they have changed the head design from a D to the more Hemi, then I would agree. If the head has not changed and the torque it there, I would agree. But then you'll need race gas and lots of retard because I tired that with just minimal head grinding and I would have rather matched heads. This way, I'm guessing at the cc's of the head, etc.
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Old 01-14-2011, 05:48 PM
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You will gain close to 30percent more power with a simple bore and piston change...NO need to change the heads..NO MATTER WHAT YEAR IT IS (as long as it is an evo)...If you do the conversion and run your 883 ignition and don't re-jet the carb you will have problems...You will need a 1200 ignition module with the conversion..
Here is a simple breakdown of the common upgrades...

http://www.sportster.org/tech/typica...gine-upgrades/
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Old 01-14-2011, 05:56 PM
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well it seems you guys are split on this....how about the cost? I'd have to pay someone for machining the heads

What kind of HP does a stock 1200 get?
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Old 01-14-2011, 06:10 PM
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Agreed....Do your own research (call NRHS) They have done thousands of them...Also you can call zippers...Im sure they will tell you the same thing but If I was you I would make a few call and confirm what Im saying....YOU DON'T HAVE TO TOUCH THE HEADS....All you need is pistons and an ignition module changed along with gaskets and such....
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Old 01-14-2011, 06:15 PM
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A solid mount 1200 stock will get you 60 or so....Rubber mount around 65...throw on some pipes and you will probally get another 5hp or so...N2 cams work fine with the 883 heads and with pipes will get you even more...
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Old 01-14-2011, 06:20 PM
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I've got a custom with an Ultima 113 in it. I realize I'm not going to get the HP out of the sporty that I do out of the Ultima but I'm looking to get as much as I can without getting too radical and spending too much $ . I'm a rather large fellow at about 290lbs so I need a little more pep than some
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Old 01-14-2011, 06:41 PM
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Im 250lbs and with a basic conversion you can SMOKE Twinkie's and BT's......Hell people don't realize a STOCK 1200 is the 2nd fastest and quickest Harley makes...(second to the Vrod..) If you want to push the envelope get some late model 1200 heads (stock is fine),N4 cams and a good exhaust and you will be pushing 80hp with a good tune...(Been there done that.....)
Im pushing well over 80 DYNO hp as it sits now...BTW my current build is using a 113 ultima also!

My Sporty...

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Old 01-14-2011, 07:10 PM
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nice looking sporty
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Old 01-14-2011, 07:24 PM
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Thanks...My current build is running a 113 Ultima also...Shooting for end of the month to fire her up!!! (wish me luck)

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Old 01-14-2011, 08:04 PM
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another nice looking ride
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