A vehicle comprises a vehicle body. An internal combustion engine is mounted to the vehicle body. The engine comprises a crankshaft mounted in a crankcase. A drive system is mounted to the vehicle body. A transmission is coupled with the drive system. A coupling system couples the engine with the transmission. The coupling system comprises a drive member and a driven member. The drive member is coupled with the crankshaft. The driven member is coupled with the transmission. The driven member is rotatably mounted in the crankcase. The drive member is coupled with the driven member.