XV monoshock spine frame diagram

These diagrams show the spine frame configuration of the early XV Virago models (including the chain drive TR1). Like some other models of the time such as the Honda CB250/400 Hawk, the pressed steel backbone uses the engine as a stressed member, the cylinder studs and cases are very heavy duty to cope with the forces involved. Such designs can allow very clean, uncluttered builds. In the case of the XV frame, the lower portion of the main frame can be cut and capped, with similar modifications done to the bolt on swingarm pivot section to really clean up the rear of the engine. This only works with the 81-83 monoshock types; in 1984 Yamaha switched to a more traditional twin shock design, making the rear of the main frame more complicated and hence more of a pain to modify.