Twin cooled
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From: Coal grove ohio 45638
Twin cooled
Does any one kno what cc’s the stock combustion chamber size is on a 103 twin cooled engine.I purchased a set of cnc ported screamin eagle heads and im tryin to figure out what the size of my stock heads should b and if these have been milled ? Thanks for all replies and info !
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My head porter did a "light cleanup cut" on the sealing surface, arrived at 84cc.
'15 wethead.
YMMV
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'15 wethead.
YMMV
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Also on amazon.com...
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From: Coal grove ohio 45638
oh ok thanks i was thinkin thats how they raised the compression compared to the air cooled ! I cc’ed the screamin eagle heads and keep comin up with 78 cc .
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From: Coal grove ohio 45638
scott can you tell me what exactley moco did to raise the compression on the twin cooled (water cooled ) i have ask this a few times and never realy got a forsure answer the heads have a pear shaped combustion chamber not like the standard oil and water cooled bikes ? Thanks harley tells me they use a .045 head gasket ! Thanks
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HD lists compression for both 103 motors, air cooled and twin cooled, at 10:1; compression is the same for both.
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From: Coal grove ohio 45638
oh i thought air cooled was advertised at 9.7:1 an twin cooled at 10:1?
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Not the HO103 motors; both at 10:1; the "regular" 103 is, as you point out, advertised at 9.7:1.
Last edited by djl; Nov 27, 2017 at 10:10 AM.
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From: Coal grove ohio 45638
