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> 883 big bore conversion
1883rider
post May 18 2013, 01:52 PM
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BIKE: XL Sportster 883
YEAR: 2004
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i'm looking into a big bore conversion for my '04 xl883. anyone having experience doing this willing to share info i'd like to hear your input, thanks...
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Ohio HD
post Jun 2 2013, 08:47 AM
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BIKE: FLHX Street Glide
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Easiest way to get there is a set of conversion pistons.

http://www.sscycle.com/product/Sportster/T...els-p24865.html

These allow you to retain the 883 heads and not get the mechanical compression too high. There are other things one might do to give performance, cams, carb, exhaust, headwork, etc. But if the goal is to make a good running very streetable 1200, then just pistons and jet the original carb, and it'll actually surprise you. Have done many of these in the past using Wiseco pistons, but that is who makes S&S pistons now anyway.

Most importantly, find a good machine shop to bore the cylinders from 3.000" to 3.500" inch. Preferably someone who does Harley cylinders. It won't be cheap, that's a lot of material to remove.

This post has been edited by Ohio HD: Jun 2 2013, 08:49 AM
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Ohio HD
post Jun 2 2013, 08:56 AM
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Oh yeah, just buy a 1200 cc top end gasket kit, or just the gaskets that you need for a 1200 if you prefer.
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prodrag1320
post Aug 30 2013, 10:49 AM
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get a set of wiseco 883-1200 dished pistons & have a good shop bore your cylinders,we do 883-1200 kits all the time
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94XR900
post Oct 30 2017, 10:16 PM
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From: Berkeley, California
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YEAR: 1994
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I put a 1200 Big bore kit in my 94 883 & must say it makes a big difference! More torque and power, the down side is the gears for the 883 will not allow the big bore motor to achieve the top end on the free way!
On the street itís a beast! Tuned the carb at 180/45 jets, 2 3/4 turns out ran drag pipes, ran good & loud, changed to growl pipes, got more power but didnít like the hollow sound they gave the bike, went to stock pipes w/ crossover and cycle shack mufflers w/ baffles removed and am happy with that. After 2000 mile break in, now at 5000+ on the big bore motor, the bike runs great!
Now I want more! The CVO STREET is looking like my next toy to get, the wife can have the Sporty!
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Night Rider Ver2
post Oct 31 2017, 07:05 AM
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or really step up and get a vrod ... like a nightrod .... crazy fun and will be MUCH faster than other Harleys ...




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