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what if any is most bore increase on xl1200

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Old Nov 9, 2007 | 08:24 PM
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Default what if any is most bore increase on xl1200

You can go 883 to1200 conversion. But what is the most has anyone gone up to if any. over 1200cc What is the most hp can be had out of a Evolution engine.
 
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Old Nov 9, 2007 | 08:44 PM
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Default RE: what if any is most bore increase on xl1200

The recommendations I've had was to not go over a 3 13/16" bore for iron lined aluminum heads. This would give you 88 CI.

A 3 7/8" bore would give you 90 CI, but I believe most that are doing this are using cast iron cylinders for added strength.

 
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Old Nov 9, 2007 | 09:12 PM
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Default RE: what if any is most bore increase on xl1200

I think the 90" ci also requires case boring as well. [/align]
 
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Old Nov 9, 2007 | 09:51 PM
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Default RE: what if any is most bore increase on xl1200

I'm pretty sure that case boring is required for both the 88" and 90", but not required for the more common 1250cc upgrade.

 
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Old Nov 9, 2007 | 11:58 PM
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Default RE: what if any is most bore increase on xl1200

ORIGINAL: carlo

You can go 883 to1200 conversion. But what is the most has anyone gone up to if any. over 1200cc What is the most hp can be had out of a Evolution engine.
Pretty good info on parts cost and various options here:

http://www.nrhsperformance.com/ekitsportster04.shtml
 
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Old Nov 10, 2007 | 12:30 AM
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Default RE: what if any is most bore increase on xl1200

Boring stock cylinders: 1212cc (actually I think you might be able to go more than 1212, but I don't know how much)
New cylinders: 1250cc
Boring stock cases: 88 CI (actually it's 87 CI, but called a 88 CI kit)
 
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Old Nov 10, 2007 | 07:03 AM
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Default RE: what if any is most bore increase on xl1200

Zippers makes a 100" kit. No clue on the cost. Here's the link http://www.zippersperformance.com/ca...&prod=2063
 
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Old Nov 10, 2007 | 07:31 AM
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Default RE: what if any is most bore increase on xl1200

As far as i know and have always gone by, is that stock cylinders on an Evo 1200should not be bored more than .030 over stock
I believe the Ironheads could go as much as .060
 
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