50mm Domed Piston Kit Fits Honda CT90 CL90 S90 SL90 ST90

A standard 50mm domed piston kit for the Honda 90cc single-cylinder bikes of 1966 to 1979: the CT90 Trail 90, CL90, S90, SL90, ST90, CM90, CM91, CS90, C90 and the ATC90. The kit contains the piston, a ring set with a chrome top ring, second ring and three-piece chrome oil ring, the wrist pin and two circlips. The domed crown raises the compression ratio over a flat-top piston, so check piston-to-head clearance on assembly. Ring set cross-references: 13011-121-762 and 13011-102-732; related numbers 13010-028-000, 13010-028-020, 13010-028-025 and 13010-028-035. For a standard 50mm bore only; a cylinder bored .010 (50.25mm), .020 (50.50mm), .030 (50.75mm) or more needs the matching oversize piston. Use a ring compressor to fit the cylinder over the rings, and find the cause of a seizure before rebuilding.

• 50MM DOMED PISTON KIT - A standard 50mm domed piston with a ring set (chrome top ring, second ring and three-piece chrome oil ring), wrist pin and two circlips.
• FITS HONDA 90CC SINGLES, 1966 TO 1979 - CT90 Trail 90, CL90, S90, SL90, ST90, CM90, CM91, CS90, C90 and the ATC90. Check the model and that the bore is still standard before ordering.
• DOMED CROWN - The raised crown raises the compression ratio over a flat-top piston. Check piston-to-head clearance on assembly.
• RING SET CROSS-REFERENCES - 13011-121-762 and 13011-102-732; related numbers 13010-028-000, 13010-028-020, 13010-028-025 and 13010-028-035.
• STANDARD BORE ONLY - For a 50mm bore. A cylinder bored .010, .020, .030 or more needs the matching oversize piston. Use a ring compressor to fit the cylinder over the rings, and find the cause of a seizure before rebuilding.