Kickstart only. 72-48 drive ratio. Made from 3596-T6 aluminum that is cast and machined in-house by BDL to insure perfect quality; everytime. Excellent wear characteristics and like all open drives; easy access. Will handle up to and including the brute power of high performance custom Big Bore and/or stroker motors with ease. Complete with the BDL''s Competitor clutch assembly with spring pressure plate. Comes with Aramid friction plates for maximum performance under extreme heat conditions. Note: See 518587 for the replacement 3" wide 132t. 8mm pitch belt.