What are the different models of the EX250?
Sure, we always say that nothing has changed since 1988, but there have been a few different models of the bike over the years, some not available in the US. If you're trying to find out which colors were available in which years, go here.
Brief model descriptions
EX250-E through -H have the same basic engine, with the -H having the most radical changes (side covers). The EX250-J engine has major internal revisions, while maintaining the general shape of the EX250-F engine casing.
This chart shows the model name equivalents:
Bike Nomenclature & EX250 History/Heritage
As you can see from this chart, calling one bike an EX and the other a ZZR is not only confusing, but plain wrong. They're all EX Something.
The EX250-C has virtually nothing in common with any of the later bikes. Not much is known about the -A, -B, or –D. If they were ever made, they didn't make it here.
The EX250-G (GPX-250R II) has many parts in common with the EX250-F: Same engine, same plugs, same carb setup. The G model was never imported into North America, and the primary differences are a larger (width) front wheel (taking 110/80-16 tires), two front rotors, two front calipers, and different left-hand fork lower.
The EX250-H (ZZR-250) has very few parts in common with the EX250-F, the exceptions primarily being the engine, but not the engine cases. The EX250-E, F, and G all use the base EX250-E engine.
Prior to the EX250-C, we had the ER250B (aka z250T Scorpion) starting in 1983. The ER250B had Unitrak rear suspension and belt drive, but was otherwise pretty much the same as the Z250B (earliest - 1981), which was pretty much the same as the Z250A (earliest - 1979).