Triumph unit 650 piston set with U.S.A. made Hastings piston rings. Pistons are JCC/EMGO brand that we use all the time since Hepolite disappeared! Will fit all unit 650 twins from 1963 to 1974 & some Triumph pre-unit 650 twins as well. 9:1 compression ratio, sold as a complete kit including pistons, wrist pins, circlips, & piston ring set, enough to rebuild one engine.
Please note: Hastings does not offer +.030 ring sets for Triumph 650 twins. US made Grant Piston Rings will be supplied with purchase of +.030 pistons and rings.