Std cyl. bore: 3.75" (95.25mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. Oil ring: 2.5mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.)
Standard cylinder bore: 3.937" (100mm) bore. 1st. ring: 1.2mm. 2nd ring: 1.2mm Oil ring: 2.0mm Stock replacement for 107" models. Comes with a chrome top ring; a ductile iron Napier 2nd. ring and a chrome flex-vent 3-piece oil ring. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.)
Standard cylinder bore: 3.937" (100mm) bore. 1st. ring: 1.2mm. 2nd ring: 1.2mm Oil ring: 2.0mm Stock replacement for 107" models. Comes with a chrome top ring; a ductile iron Napier 2nd. ring and a chrome flex-vent 3-piece oil ring. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.)
Standard cylinder bore: 3.937" (100mm) bore. 1st. ring: 1.2mm. 2nd ring: 1.2mm Oil ring: 2.0mm Stock replacement for 107" models. Comes with a chrome top ring; a ductile iron Napier 2nd. ring and a chrome flex-vent 3-piece oil ring. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.)
Standard cylinder bore: 4.016" (102mm). 1st. ring: 1.2mm. 2nd ring: 1.2mm. Oil ring: 2.0mm. Stock replacement for 114" models. Comes with a chrome top ring; a ductile iron Napier 2nd. ring and a chrome flex-vent 3-piece oil ring. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.)
Standard cylinder bore: 4.016" (102mm). 1st. ring: 1.2mm. 2nd ring: 1.2mm. Oil ring: 2.0mm. Stock replacement for 114" models. Comes with a chrome top ring; a ductile iron Napier 2nd. ring and a chrome flex-vent 3-piece oil ring. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.)
Standard cylinder bore: 4.016" (102mm). 1st. ring: 1.2mm. 2nd ring: 1.2mm. Oil ring: 2.0mm. Stock replacement for 114" models. Comes with a chrome top ring; a ductile iron Napier 2nd. ring and a chrome flex-vent 3-piece oil ring. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.)
Comes with parkerized cast gray iron compression and oil rings. Used with early style 1929-1949 type pistons with the one-piece cast iron oil ring. Std cyl. bore: 2.745" (69.72mm). 1st ring: 2.3mm (3/32). 2nd ring: 2.3mm (3/32''). Oil ring: 3.2mm (1/8"). Note: OEM 1950-1973 pistons are equipped with 1/16" (1.6mm) 1st. & 2nd rings and late style 3/16" (4.75mm) 3-piece flex-vent style oil rings for improved oil control; for these Hastings rings see 1950-1973 Flathead model years. Above mentioned rings will not fit the 1950-1973 new type pistons. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Comes with parkerized cast gray iron compression and oil rings. Used with early style 1929-1949 type pistons with the one-piece cast iron oil ring. Std cyl. bore: 2.745" (69.72mm). 1st ring: 2.3mm (3/32). 2nd ring: 2.3mm (3/32''). Oil ring: 3.2mm (1/8"). Note: OEM 1950-1973 pistons are equipped with 1/16" (1.6mm) 1st. & 2nd rings and late style 3/16" (4.75mm) 3-piece flex-vent style oil rings for improved oil control; for these Hastings rings see 1950-1973 Flathead model years. Above mentioned rings will not fit the 1950-1973 new type pistons. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Comes with parkerized cast gray iron compression and oil rings. Used with early style 1929-1949 type pistons with the one-piece cast iron oil ring. Std cyl. bore: 2.745" (69.72mm). 1st ring: 2.3mm (3/32). 2nd ring: 2.3mm (3/32''). Oil ring: 3.2mm (1/8"). Note: OEM 1950-1973 pistons are equipped with 1/16" (1.6mm) 1st. & 2nd rings and late style 3/16" (4.75mm) 3-piece flex-vent style oil rings for improved oil control; for these Hastings rings see 1950-1973 Flathead model years. Above mentioned rings will not fit the 1950-1973 new type pistons. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Comes with parkerized cast gray iron compression and oil rings. Used with early style 1929-1949 type pistons with the one-piece cast iron oil ring. Std cyl. bore: 2.745" (69.72mm). 1st ring: 2.3mm (3/32). 2nd ring: 2.3mm (3/32''). Oil ring: 3.2mm (1/8"). Note: OEM 1950-1973 pistons are equipped with 1/16" (1.6mm) 1st. & 2nd rings and late style 3/16" (4.75mm) 3-piece flex-vent style oil rings for improved oil control; for these Hastings rings see 1950-1973 Flathead model years. Above mentioned rings will not fit the 1950-1973 new type pistons. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Std cyl. bore: 3.3465" (85.00mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. oil ring: 2.75mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Std cyl. bore: 3.3465" (85.00mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. oil ring: 2.75mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Std cyl. bore: 3.3465" (85.00mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. oil ring: 2.75mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Std cyl. bore: 3.00" (76.20mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. oil ring: 2.75mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Std cyl. bore: 3.00" (76.20mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. oil ring: 2.75mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings. Std cyl. bore: 3.625" (92.075mm). 1st ring: 2.0mm. 2nd ring: 2.0mm. oil ring: 4.75mm. Note: When 3-5/8" S&S pistons are used you should; in practically all cases; use the Hastings rings for S&S pistons that are mentioned as ''S&S 3-5/8 Big Bore''. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings. Std cyl. bore: 3.625" (92.075mm). 1st ring: 2.0mm. 2nd ring: 2.0mm. oil ring: 4.75mm. Note: When 3-5/8" S&S pistons are used you should; in practically all cases; use the Hastings rings for S&S pistons that are mentioned as ''S&S 3-5/8 Big Bore''. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings. Std cyl. bore: 3.625" (92.075mm). 1st ring: 2.0mm. 2nd ring: 2.0mm. oil ring: 4.75mm. Note: When 3-5/8" S&S pistons are used you should; in practically all cases; use the Hastings rings for S&S pistons that are mentioned as ''S&S 3-5/8 Big Bore''. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings. Std cyl. bore: 3.625" (92.075mm). 1st ring: 2.0mm. 2nd ring: 2.0mm. oil ring: 4.75mm. Note: When 3-5/8" S&S pistons are used you should; in practically all cases; use the Hastings rings for S&S pistons that are mentioned as ''S&S 3-5/8 Big Bore''. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company; Inc.)
Std cyl. bore: 3.4980" (88.85 mm). 1st. ring: 1.6mm. 2nd ring: 1.6mm. oil ring: 4.0mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.).
Std cyl. bore: 3.4980" (88.85 mm). 1st. ring: 1.6mm. 2nd ring: 1.6mm. oil ring: 4.0mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.).
Std cyl. bore: 3.4980" (88.85 mm). 1st. ring: 1.6mm. 2nd ring: 1.6mm. oil ring: 4.0mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.).
Std cyl. bore: 3.4980" (88.85 mm). 1st. ring: 1.6mm. 2nd ring: 1.6mm. oil ring: 4.0mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.).
Std cyl. bore: 3.4980" (88.85 mm). 1st. ring: 1.6mm. 2nd ring: 1.6mm. oil ring: 4.0mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.).
Std cyl. bore: 3.4980" (88.85 mm). 1st. ring: 1.6mm. 2nd ring: 1.6mm. oil ring: 4.0mm. Tech tip: Piston grooves vs piston rings. It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company; Inc.).
S&S chr/moly replacement piston ring set. Fits all Evolution & pre-Evolution engines that are equipped with an S&S 3-5/8" big bore kit that have 1/16" (1.5mm) compression rings and 5/32" (4.2mm) oil rings. Will also fit other manufacturers 3-5/8" Big Bore kits (like some Axtell kits); that are equipped with the same piston grooves. Std cyl. bore: 3.625" (92.075mm). 1st ring: 1.5mm (.058"). 2nd ring: 1.5mm (.058"). oil ring: 4.2mm (.155"). Note compression ring gap: To determine the correct ring gap on your newly installed piston rings is very important. A too narrow gap may result in premature piston ring/cylinder wall wear or even seizure; possibly breaking rings and/or damage to pistons and/or cylinder walls; and so on. A piston ring gap that is wider than necessary will result in needless compression loss and reduced engine efficiency. Recommended ring gap is .004" per inch of cylinder diameter for street engines. For a 3-5/8" (3.625") bore engine piston ring gap would be 3.625" x .004" = .0145". (.0145" x 25.4 = 0.3683mm or; when rounded of; 0.37mm). Information provided by S&S Cycle; Inc.
S&S chr/moly replacement piston ring set. Fits all Evolution & pre-Evolution engines that are equipped with an S&S 3-5/8" big bore kit that have 1/16" (1.5mm) compression rings and 5/32" (4.2mm) oil rings. Will also fit other manufacturers 3-5/8" Big Bore kits (like some Axtell kits); that are equipped with the same piston grooves. Std cyl. bore: 3.625" (92.075mm). 1st ring: 1.5mm (.058"). 2nd ring: 1.5mm (.058"). oil ring: 4.2mm (.155"). Note compression ring gap: To determine the correct ring gap on your newly installed piston rings is very important. A too narrow gap may result in premature piston ring/cylinder wall wear or even seizure; possibly breaking rings and/or damage to pistons and/or cylinder walls; and so on. A piston ring gap that is wider than necessary will result in needless compression loss and reduced engine efficiency. Recommended ring gap is .004" per inch of cylinder diameter for street engines. For a 3-5/8" (3.625") bore engine piston ring gap would be 3.625" x .004" = .0145". (.0145" x 25.4 = 0.3683mm or; when rounded of; 0.37mm). Information provided by S&S Cycle; Inc.
S&S chr/moly replacement piston ring set. Fits all Evolution & pre-Evolution engines that are equipped with an S&S 3-5/8" big bore kit that have 1/16" (1.5mm) compression rings and 5/32" (4.2mm) oil rings. Will also fit other manufacturers 3-5/8" Big Bore kits (like some Axtell kits); that are equipped with the same piston grooves. Std cyl. bore: 3.625" (92.075mm). 1st ring: 1.5mm (.058"). 2nd ring: 1.5mm (.058"). oil ring: 4.2mm (.155"). Note compression ring gap: To determine the correct ring gap on your newly installed piston rings is very important. A too narrow gap may result in premature piston ring/cylinder wall wear or even seizure; possibly breaking rings and/or damage to pistons and/or cylinder walls; and so on. A piston ring gap that is wider than necessary will result in needless compression loss and reduced engine efficiency. Recommended ring gap is .004" per inch of cylinder diameter for street engines. For a 3-5/8" (3.625") bore engine piston ring gap would be 3.625" x .004" = .0145". (.0145" x 25.4 = 0.3683mm or; when rounded of; 0.37mm). Information provided by S&S Cycle; Inc.
S&S chr/moly replacement piston ring set. Fits all Evolution & pre-Evolution engines that are equipped with an S&S 3-5/8" big bore kit that have 1/16" (1.5mm) compression rings and 5/32" (4.2mm) oil rings. Will also fit other manufacturers 3-5/8" Big Bore kits (like some Axtell kits); that are equipped with the same piston grooves. Std cyl. bore: 3.625" (92.075mm). 1st ring: 1.5mm (.058"). 2nd ring: 1.5mm (.058"). oil ring: 4.2mm (.155"). Note compression ring gap: To determine the correct ring gap on your newly installed piston rings is very important. A too narrow gap may result in premature piston ring/cylinder wall wear or even seizure; possibly breaking rings and/or damage to pistons and/or cylinder walls; and so on. A piston ring gap that is wider than necessary will result in needless compression loss and reduced engine efficiency. Recommended ring gap is .004" per inch of cylinder diameter for street engines. For a 3-5/8" (3.625") bore engine piston ring gap would be 3.625" x .004" = .0145". (.0145" x 25.4 = 0.3683mm or; when rounded of; 0.37mm). Information provided by S&S Cycle; Inc.
S&S chr/moly replacement piston ring set. Fits all Evolution & pre-Evolution engines that are equipped with an S&S 3-5/8" big bore kit that have 1/16" (1.5mm) compression rings and 5/32" (4.2mm) oil rings. Will also fit other manufacturers 3-5/8" Big Bore kits (like some Axtell kits); that are equipped with the same piston grooves. Std cyl. bore: 3.625" (92.075mm). 1st ring: 1.5mm (.058"). 2nd ring: 1.5mm (.058"). oil ring: 4.2mm (.155"). Note compression ring gap: To determine the correct ring gap on your newly installed piston rings is very important. A too narrow gap may result in premature piston ring/cylinder wall wear or even seizure; possibly breaking rings and/or damage to pistons and/or cylinder walls; and so on. A piston ring gap that is wider than necessary will result in needless compression loss and reduced engine efficiency. Recommended ring gap is .004" per inch of cylinder diameter for street engines. For a 3-5/8" (3.625") bore engine piston ring gap would be 3.625" x .004" = .0145". (.0145" x 25.4 = 0.3683mm or; when rounded of; 0.37mm). Information provided by S&S Cycle; Inc.
S&S chr/moly replacement piston ring set. Fits all S&S 4" bore Super Sidewinders (incl. TC). Std cyl. bore: 4.00" (101.60mm). Note compression ring gap: To determine the correct ring gap on your newly installed piston rings is very important. A too narrow gap may result in premature piston ring/cylinder wall wear or even seizure; possibly breaking rings and/or damage to pistons and/or cylinder walls; and so on. A piston ring gap that is wider than necessary will result in needless compression loss and reduced engine efficiency. Recommended ring gap is .004" per inch of cylinder diameter for street engines. For a 3-5/8" (3.625") bore engine piston ring gap would be 3.625" x .004" = .0145". (.0145" x 25.4 = 0.3683mm or; when rounded of; 0.37mm). Information provided by S&S Cycle; Inc.
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