page_title: Straight-six engine
section_title: Motorcycle use
hierarchical_section_title: Straight-six engine / Motorcycle use
context_page_description: The straight-six engine is an internal combustion engine, with six cylinders mounted in a straight line along the crankcase with all the pistons driving a common crankshaft.
  The bank of cylinders may be oriented at any angle, and where the bank is inclined away from the vertical, the engine is sometimes called a slant-six. The straight-six layout is the simplest engine layout that possesses both primary and secondary mechanical engine balance, resulting in much less vibration than engines with fewer cylinders.
context_section_description: Honda raced a number of straight-six engines in the Honda RC series of motorcycles, starting with the 249 cc (15.2 cu in) 3RC164 in 1964, with a bore of 39 mm, and a stroke of 34.8 mm. This became the RC165 in 1965. For 1966, bore and stroke became 41 mm and 31 mm 246 cc (15.0 cu in) in the RC166, continuing with the RC167 in 1967. Also in 1967, Honda raced the straight-six 297 cc (18.1 cu in) RC174 in the 350 class, with bore and stroke of 41 mm and 37.5 mm.
  For road use, Honda introduced the Honda CBX in 1978. Kawasaki introduced the 1,300 cc (79 cu in) KZ1300 in 1979. Benelli introduced the first production motorcycle with a 6-cylinder engine the 750 Sei in 1972, which was later enlarged to 900 cc (55 cu in) to become the 900 Sei.
  BMW has developed a straight-six engine for motorcycle use, debuting in a concept bike in 2009, which features on the K1600GT and K1600GTL motorcycles that were launched in 2011. The 1,649 cc (100.6 cu in) engine is mounted transversely across the chassis.
caption: Honda CBX engine
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