T6061 aluminum collar and plate adapters fit over the existing Yamaha YG4i Apex or YG4 RX1 crankcase cover and provide secure, aligned & pinned attachment points for all types of gearboxes, including the most popular Mohawk AK7, as well as Rotax C, Hirth, Simonini, Arrow, etc.  In use since 2012.

YG4 Gearbox Adapters

  • Please contact MAC to provide your PTO shaft cover after you place your adapter order, so that the cover and adapter can be aligned and pinned as a set.  If you have not yet purchased an engine, contact MAC to arrange for a core charge credit.