The Yamaha T-150 is an underbone model manufactured by Yamaha Motor Company since 2015. It is marketed under the names Exciter 150/155 in Thailand and Vietnam, Sniper 150 MXi in the Philippines and Singapore, Jupiter MX/MX King 150 in Indonesia and Iran, and Y15ZR/Y16ZR in Malaysia. It is powered by a 149.7 cc (9.14 cu in) or a 155.1 cc (9.5 cu in) single-cylinder engine.

An underbone is a type of motorcycle that uses structural tube framing with an overlay of plastic or non-structural body panels and contrasts with monocoque or unibody designs where pressed steel serves both as the vehicle's structure and bodywork. Outside Asia, the term underbone is commonly misunderstood to refer to any lightweight motorcycle that uses the construction type, known colloquially as step-throughs, mopeds or scooters.