Abstract: An adapter plate allows a motorcycle engine to be mounted to a transaxle in a dune buggy. The engine is of the type having an output shaft located on one side of the engine that faces rearwardly. The transaxle has a bell housing that is centered and faces forwardly. The plate fits between the bell housing and the engine. The plate has an aperture that aligns with the output shaft of the engine and the input shaft of the transaxle. The shaft extends through the aperture for interconnecting the transaxle with the engine. Inner holes in the plate encircle the aperture for bolting the plate to the output shaft housing. Outer holes encircle the aperture and are spaced further outward for bolting the plate to the bell housing. Lugs on the forward side of the plate bolt to engine mounting lugs on the engine. A support plate extends from the frame of the vehicle down to the adapter plate and is bolted thereto for providing support.