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Discussion Starter #1
I want to do the swap from 883 to 1200 when ordering gaskets does it matter since I'm not replacing the cylinder's.??
 

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Discussion Starter #3
According to what I've read you can just bore out your cylinders but I Dont think there much price difference
 

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South GA Redneck
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A .040 OS bore on a 883 is only 3.0398". A stock bore on a 1200 is 3.4978". Don't see how it would be possible/reliable if it could be done. I would get new cylinders and the 1200 gaskets.
 

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Discussion Starter #5
Idk the specs but I've read on here people have been boring the cylinder's up to buy new cylinders its 489 plus the price of a good gasket set which is about 120 .to bore them up is about 200 cheaper.I'm only going on what I've been reading
 

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When I did the '95 a few years back, the gasket set had both size head gaskets so it was good for a 883 or 1200. I can't remember if it was a james or cometic. Everything else was the same. I think the bore job cost me about $175 because I took the jugs and pistons to the dealer and they sent them out. Great upgrade.:)
 

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Discussion Starter #7
• 74ci
• 1200cc*
• Bore: 3.498
• Stroke: 3.812*
• Rod:*6.926
• Comp hgt:*1.210
• Dish Top*
• Cylinder Head Volume: +10cc
• Compression Ratio: 49-10.0:1
• Pins:*.792
• Rings: 2 at 1/16, 1 at 3/16
• Includes spacer rings
•*No cylinder head modification required
•*2009 to present models must use 1200cc Sportster cylinders to install these pistons/kits
•*This is an 883cc to 1200cc conversion piston kit
• Kit includes 2 pistons, rings, pins, locks, assembly lube, and instructions
• KB part # KB272
 

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South GA Redneck
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3,898 Posts
When I did the '95 a few years back, the gasket set had both size head gaskets so it was good for a 883 or 1200. I can't remember if it was a james or cometic. Everything else was the same. I think the bore job cost me about $175 because I took the jugs and pistons to the dealer and they sent them out. Great upgrade.:)
Guess I stand corrected... I just would've thought that going that much bigger in the bore would leave the cylinders walls to thin... Know I know it can be done. :)
 

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Just a thought.I have the 1200 XL Custom Sporty,Now when I sit and read the owners book that came with the bike, I notice that the Gearing is different on the 883 to my 1200..So How does that affect guys that have converted there 883s to 1200s..??
 

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Supposed to be better acceleration and lower top speed. The 883 heads don't flow as good stock with the stock intake valves being a little smaller too. I was planning to eventually put buell heads and flat top pistons on mine so I put andrews n-8 cams in, but never got around to doing the extra work as it ran pretty darn good as it was. I don't think the cast iron sleeve is thick enough to be bored on the new ones also. I think you can just change the output sprocket and belt to change the gearing. (easy on a sporty) :)
 

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On the older 883s (I ain't much up on the newer stuff), the front sprocket was a 27 tooth sprocket. Lots of folks upgraded their 883s to 1200s and kept that gearing. MUCH quicker acceleration out of the hole, but man were those motors busy at highway speeds.

Stock 1200s had 29 tooth sprockets which are a huge improvement at highway speeds, but sacrifice out of the hole, red-light to red-light acceleration.

My 1200 is pretty well built with pistons, heads, cams, great exhaust, single-fire ignition--pretty much the "standard works". I experimented by changing the sprocket on mine out one time. The following weekend I changed it back. It was yee-haw fun, but if you can't keep the front end connected it kind of defeats the purpose.

I think my Sportster would have climbed straight up a telephone pole with that gearing, though. Just wasn't worth it to me. I got plenty of power as it is, and I much prefer the stock 1200 gearing for all-around street performance.

I've talked to several people that do head work, on the other hand, and they prefer to start with the stock 883 heads over the older 1200 heads. Somethin' bout they got more material to work with to do a better porting job. You upgrade your 883 to a 1200 and get your heads ported by a real professional outfit, and that little motard gonna be SCREAMIN. Don't forget to drop your driver's license off at the local PD. They gonna want it in a few days anyhow...
 
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