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Gaskets for Top End
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James Gasket Kits for Top End: Evolution Sportster
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55-123
Include all gaskets for top end overhaul.
- for Top end
- fits Sportster 883 and 1200 2007-2020
- with 0.045” Firering head gaskets
- rubber / steel / silicone
- nominal bore: 3 ” / 3-1/2 ”
- replaces Harley-Davidson part number 17049-04A
- USA
- gross weight: 397 g
Thin Head Gaskets
An easy way to increase compression ratio a tad is to install thinnner head gaskets. A snappier exhaust note and a more efficient combustion can be expected.
Example: using a .030" head gasket in lieu of a .045" will increase compression by approx. 0.25 points. So if your CR with a .045" head gasket is 9.6, the static CR will increase to 9.85 with a .030" head gasket. Valve to piston clearance must be checked where appropriate.
Have any questions?
Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com