Timing kit includes special cush drive nut with hex head for easy torqueing up, this is fitted and left on the engine permanantly as it is an upgrade from the BSA but with slots, timing setting degree disc which bolts onto cush drive nut,degree disc fitting screws, piston stop, and timing setting instructions. Can be fitted and used on swing arm BSA A7 A10 Twins, BSA B31 B33 Gold Star, M20 M21 models. Some early models with steel chaincases may need the nut od slightly reducing or chamfering on the edge.
Sorry does not fit plunger models.
