Motorcycles which are approved by the Learner Approved Motorcycle Scheme (LAMS) are considered suitable for riders on a Class 6 (motorcycle) learner or restricted licence.
Detailed information about approved motorcycles for learner and restricted riders are available on NZTA's site.
NZTA provides a comprehensive list of approved and prohobited motorcycles (PDF) as well as a leaflet with frequently asked questions (PDF).