Ninja 250 Twin Engine Models

Kawasaki EX 250 (aka GPX in Australia)

Kawasaki ZZR 250 (aka EX250H in Australia)

Kawasaki ZXR 250 (aka ZX-2R in Australia)

GPZ 250: model sold from 1986 to 1987. Also know as EX250-E. 

GPX 250: model sold in the USA and Australia from 1988 to present. Sold from 1988 to 1990 in other parts of the world. Changes in bodywork, wheels, suspension, electricals and some engine specifics from the E model. Also know as EX250-F. 

ZZR 250: sold primarily outside of the USA and Canada since 1991; Canada received this model in 2000, while the U.S. still has the EX250F model. Major rework including lateral aluminium frame, 17" wheels, adjustable rear shock, adjustable levers, reduced sprocket size, computer-controlled timing advance, electricals; same engine as the F model with different carbs (giving some extra HP's). Visual is almost identical to ZZR 600. Also know as EX250-H. 

Other Ninja 250 models

ZXR 250: model sold from 1988 to 1999. DOHC 16 valve 4 cylinder 4 carbs engine, red line at 18.500 (to 20.000 RPM); dual front discs and inverted fully adjustable front fork. A visual copy of ZXR 750. Also know as ZX-2R. 

NOTE: Kawasaki also appends a suffix to each model number, indicating the "sub model"; it increases with the model year. So, an EX250-E2 is a 1987 GPZ; an EX250-F2 is a 1988 GPX, an EX250-F14 is a 2000 GPX, and an EX250-H11 is a 2000 ZZR.