Performance Mechanical Advance Kit For Big Twin 1970-79 & Sportster 1971-Early 1979

Weight: 0.33 Shaft and plate are stainless steel machined to exact tolerances Weights are heat treated and coated with high-tech polymers to ensure smooth even advance and retract movement Included springs are high quality phosphate coated spring wire that allows full advance @ 1400 RPM (same as OE) Hardened washers on advance weight pivots to prevent premature spring wear Pre-lubricated Rivera Mechanical Advance Kit Fits Big Twin 1970-1979 & Sportster 1971-Early 1979 Also fits aftermarket ignition system that requires a mechanical advance unit