The Yamaha XJ900 was born out of the original Yamaha XJ model motorcycle, the XJ650, which was the foundation for the whole XJ series.
In its original incarnation launched in 1983, the XJ900 had an air-cooled, double overhead camshaft, 853cc 4-stroke, 4 cylinder, 8 valve engine. Originally fitted with a handlebar mounted bikini fairing, its handling came in for criticism. This was quickly replaced with a frame mounted upper fairing and retrofitted to all models. The XJ900 came with anti-dive front forks, shaft drive and triple disc brakes.
A revised version was launched in 1984 and displaced 891cc. Aside from the engine capacity increase it was equipped with more conventional forks than it’s predecessor and a belly pan came as standard. The increase in engine capacity meant the carburettors went up from 35mm to 36mm. Aside from these changes it was nearly identical to the original and was manufactured until 1994.
The XJ900 Diversion is its replacement.
Model engine and frame codes
1983 to 1984 - 853cc 31A
1984 to 1990 - 891cc 58L
1990 to 1994 - 891cc 4BB1