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Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

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  #1  
Old 25th April 2012
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theymademdoit theymademdoit is offline
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Default Replace 883 jugs with stocks 1200 jugs

I have 2007 883c and have a chance to buy a set of stock 1200 jugs and pistons. Can I just replace the jugs and pistons with the 1200 hundred jugs with little or no other modifications?
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  #2  
Old 25th April 2012
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i'm pretty sure that's ok, so long as you have new gaskets etc. Have a look at 1200 upgrade kits to see what you're missing. The big question is, why has someone taken off their 1200 jugs if there's nothing wrong with them?
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  #3  
Old 25th April 2012
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perhaps to upgrade to a 1250 kit like all the rage among this forum lately..
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  #4  
Old 25th April 2012
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You can use the jugs, but not the pistons. With your 883 heads the stock 1200 pistons will have far too high a compression ratio. You need dished 'conversion' pistons. The dished tops of the pistons, in effect, increase the volume of the combustion chamber compared to the swept volume.
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  #5  
Old 25th April 2012
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The jugs will work from 1988 and up with no issues. Most of the time all you will need to do break the glaze with a hone so the rings will seal. I would recomend that you replace the rings with new ones just to be safe. The ring sets are about $18 bucks each from harley. You will need 2 sets

Most shops will charge $20 -40 for honing and have that machine shop pocket the top of the pistons .100"deep x 2.75" diameter $40-60, $30-40 for a top end gasket kit (James or V-twin) So for around $200 and whatever you have to pay for the cylinders and pistons, you will have a 1200!

Good luck!


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  #6  
Old 25th April 2012
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Ideally you should change the ignition and put in a stronger clutch spring.
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  #7  
Old 25th April 2012
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Or....

You can scour the internet for a set of inexpensive 1200 heads, to bolt on.. Typically they can be found now and again for the $300-$500 mark (depending on your budget)
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  #8  
Old 25th April 2012
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Default

Thanks for all the replies.
So I would have to replace the pistons?
Ok so say I get the jugs and pistons for 325 about how much more would everything I need cost. Would an 1250 kit be more cost effective?
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  #9  
Old 25th April 2012
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Quote:
Originally Posted by theymademdoit View Post
Thanks for all the replies.
So I would have to replace the pistons?
Ok so say I get the jugs and pistons for 325 about how much more would everything I need cost. Would an 1250 kit be more cost effective?
All depends on your ultimate goal. How much more are you going to want down the road? Only you know that.
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  #10  
Old 25th April 2012
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You could get a little head work done to increase their displacement and keep the pistons as is. The forum has two excellent hot rodding vendors for this stuff.
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