Hastings 3.750" Bore Standard Piston Ring Set (2M4805)
- Includes top compression rings, second compression rings, and oil control rings.
- Helps in the the heat transfer process between the piston and cylinder wall.
- Controls combustion chamber gases allowing the piston to transfer the energy of the expanding combustion gases, to the crankshaft.
- Reverse twist ring along with a taper-machined ring face duplicates the OD bottom side scraping edge of a positive twist torsional ring.
- Promotes side sealing that prevents oil from being forced under and behind the ring resulting in better oil economy.
- Three-piece design allows rails to be manufactured with a small cross sectional area for better conformability to bore.
- Provides uniform pressure through four steel rails and two expanders assuring positive oil control.
- Made in the USA.
- Includes enough rings for two pistons (unless noted).
- Two rings per groove, except for the rails that will be two rail rings per one expander ring.
Top Compression Rings are Barrel Face.
Second Compression Ring are Napier.
Oil Control Rings are Three Piece Flex Vent.
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 2011 | Harley-Davidson | Blackline FXS | |
| 2008-2011 | Harley-Davidson | Cross Bones FLSTSB | |
| 2008-2011 | Harley-Davidson | Dyna Fat Bob FXDF | |
| 2007-2009 | Harley-Davidson | Dyna Low Rider FXDL | |
| 2007-2013 | Harley-Davidson | Dyna Street Bob FXDB | |
| 2007-2013 | Harley-Davidson | Dyna Super Glide Custom FXDC | |
| 2007-2010 | Harley-Davidson | Dyna Super Glide FXD | |
| 2007-2008 | Harley-Davidson | Dyna Wide Glide FXDWG | |
| 2010-2011 | Harley-Davidson | Dyna Wide Glide FXDWG | |
| 2007-2011 | Harley-Davidson | Electra Glide Classic FLHTC | |
| 2007-2009 | Harley-Davidson | Electra Glide FLHT | |
| 2007-2011 | Harley-Davidson | Electra Glide Ultra Classic FLHTCU | |
| 2007-2011 | Harley-Davidson | Fat Boy FLSTF | |
| 2010-2011 | Harley-Davidson | Fat Boy Lo FLSTFB | |
| 2007-2011 | Harley-Davidson | Heritage Softail Classic FLSTC | |
| 2007-2009 | Harley-Davidson | Night Train FXSTB | |
| 2010-2011 | Harley-Davidson | Road Glide Custom FLTRX | |
| 2007-2009 | Harley-Davidson | Road Glide FLTR | |
| 2007-2010 | Harley-Davidson | Road King Classic FLHRC | |
| 2007 | Harley-Davidson | Road King Custom FLHRS | |
| 2007-2011 | Harley-Davidson | Road King FLHR | |
| 2008-2011 | Harley-Davidson | Rocker C FXCWC | |
| 2008-2009 | Harley-Davidson | Rocker FXCW | |
| 2007-2010 | Harley-Davidson | Softail Custom FXSTC | |
| 2007-2011 | Harley-Davidson | Softail Deluxe FLSTN | |
| 2007 | Harley-Davidson | Softail Deuce FXSTD | |
| 2007 | Harley-Davidson | Softail Springer Classic FLSTSC | |
| 2007 | Harley-Davidson | Softail Standard FXST | |
| 2007-2011 | Harley-Davidson | Street Glide FLHX | |