NEW OEM Timing Chain Tensioner Kit Sold as a Pair, enough to do one vtwin engine. Fits: 500 570 650 800HO 800R 850 1000 1000R engines.   Part numbers 711641150 420641150 420430370 420430373 290250890 420250890 711238120 420238120 420236520 420236521 711236520 711236510 420236510