The Honda CB-1 is a small and light naked sportsbike with a straight-four 399 cc. The Honda model code is NC27. In contrast to all other models of the Honda CB series, the name is written with a hyphen. In some countries it was sold as Honda CB400F as an attempt to connect the model with the original CB400F of 1975, with which it has nothing else in common.The bike was first introduced in 1989 and built until the end of 1990. Originally developed for the Japanese market, the CB-1 was also officially sold in the USA and Canada.
The CB-1 engine is similar to the early NC23 models CBR400RR, with changes to the port lengths and angles as well as smaller valves and lower compression ratio; changes in the primary and secondary gear ratios reduced the 60 mph (97 km/h) first gear down to around 30 mph (48 km/h), making the slightly less powerful CB-1 feel much quicker from a standstill than its sportier sibling, All engines derived from the NC23 block carry the NC23 ID code in the engine number; this includes the NC27, 23, 29, 31 etc., including the VTEC models with chain driven cams. Like many of its stablemates, the CB-1 has straight gear-driven dual camshafts with self-silencing gears to reduce whine.
