Genuine Hepolite piston rings are designed for specific applications and are manufactured to exacting standards for precise fitment. This set of Triumph 750 piston rings is designed for fitment to most Triumph twins from 1973 with 76mm pistons. Not a direct replacement for the early 1973 TR7V models before engine number AH24040 and T140V models before engine number XH22019.
This piston ring set is specific to the Triumph 76mm 750 models. The top compression ring features PVD chromium nitriding on the ring face. The lower compression ring is coated with a black phosphate, and the 2-piece oil control ring uses an expander spring, providing a superior radial distribution of pressure across the cylinder bore. Made in the UK.
The piston rings form a seal during compression and promote oil lubrication of the cylinder bore walls. They must be accurately sized to fit in the piston ring grooves with clearance. The Hepolite piston rings are an excellent complement to the JCC/Emgo piston sets we offer.
Ring end gaps must be checked and adjusted, if necessary, prior to fitment to the pistons. Care must be taken when handling piston rings, as they are brittle and can be broken if mishandled, especially during fitment to the pistons. Suggested ring end gaps are .004″-.006″ per inch of bore for compression rings. End gap for the oil control ring is not as critical as the expander spring creates the even tension. The installation of the expander spring must be such that the gap of the spring is 180 degrees apart from the gap in the oil control ring.
Note: Early TR7V and T140V models with 724cc cylinder bores and 75mm pistons are not direct fitment with these piston rings intended for 76mm pistons, however due to the scarcity of the 75mm piston rings, ring gaps can be adjusted to work on the early 75mm pistons, as a compromise, only when the 75mm piston rings are unobtainable.
Available sizes include: Standard, +.020, +.040, and +.060. Select your desired size from the drop-down menu.
