THESE PARTS ARE MOSTLY FOR Z50 XR50/70 CRF50/70 ATC70 CT70 AND TRX90'S @ COMPONENT ENGINE PARTS_ONLY @ ENGINE_KITS @ CARBURATION AND INTAKE CDI CONVERSION KITs ((_NEW_)) @ ELECTRICAL UPDATES @ EXHAUST @ SUSPENSION PARTS @ NEW !!! SOME TECH INFO DrATV (JACK) CYLINDER BORING (link)