This layout allowed the real fuel tank to sit behind the cylinders, low between the frame rails, and further aided with lowering the center of gravity.

This system located in the lower exhaust manifold helps maintain high back pressure at low engine speeds, and opens up more at higher engine speeds, giving the motor better mid-range power.

The EXUP system was mainly found in US and some European models to compensate for the loss of power caused by emissions related modifications for those markets.

In 1994 we saw the introduction of the 4JH model exclusively for the European and Asian markets, the main difference being the replacing of the twin circular headlights with the now famous twin "Cats eyes" style headlights that also happen to be found on the successor of the FZR600, the 1994-1996 YZF600R.

Along with some minor bodywork changes in order to update the styling and accompany the new headlights.