new rebuild sportster
10-06-2017, 08:15 AM
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new rebuild sportster
I'm using an old set of TRW forged pistons + 0.040 --and need to know the correct clearance to wall ----1974 sportster 1000 --+.040
10-06-2017, 10:48 AM
Join Date: Jul 2012
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Stock bore should be 3.187.
10-06-2017, 03:22 PM
Join Date: Mar 2010
Location: SoCal hi desert
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I checked some old TRW books, only see pistons for the 900 but they don't show the spec for clearance on those. Sorry.
10-06-2017, 03:27 PM
Join Date: Mar 2010
Location: SoCal hi desert
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I don't know if it's relevant but the KB piston catalog shows .0025 for forged pistons in a cast iron air-cooled cylinder. Old TRW's may be a bit less consistent in their expansion than a new KB.
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10-06-2017, 08:15 AM
new rebuild sportster
