1987 Dreadnok Cycle
Dominator courtesy of the Yo Joe Outlet. Please visit them on eBay.
NOTE: Although the box art showed Zandar and Zarana riding the Dreadnok Cycle, and they're pictured above, the did NOT come with it.
Interestingly, the Dreadnok Cycle is called the Dreadnok Tri-Cycle on the blueprint.
Dreadnok Cycle blueprint/instructions courtesy of Tim Dz.