Carburettors with the 2 throttles commanded by 2 linkages connected to a pulley (and 2 push and pull cables: push to close and pull to open the throttle) for USA models and some Japanese models ("desmodromique" system). The cover of the carbs are not screw but held on by 3 screws. The two carbs are bolted together with two brackets. They have non adjustable jet needles, and only the geniune needle jet is available in order to owners don't adjust carbs setting for the good works of catalyst system to respectect the pollution level authorized by the EPA (Environmental Protection Agency) like we can see on the against sticker on the bike. Fuel tank filler have a restricted diameter to only accept unleaded size nozzles.

Higher handlebar for RZ250RR 51L with full fairing in Japan.

The RZ250R 1AR without fairing (sold at the same time) had standard (shorter) version.

Lateral reflector for USA, Australia & Canada.

352cm3 displacement + different Carb setting + restricted Exhaust with "catalyst" part metal working with unleaded fuel only + longer rear mudguard (rear fender) for 1WU Swiss model to be OK with noise emission law. This model is restricted @ 45HP (33.3 kW). Fuel tank filler have a restricted diameter to only accept unleaded size nozzles. Thick noise insulating foam in the lower cowl.

'85 51L YPVS controler unit instead of '86 1UA controler

Partial fairing and not perforated brake disks (disk brake #1 et #2), '83 cylinders (31K model) with carburettors without power-jets like '83 one & specific cylinder head wich do a compression ration of 5:1 for '86 & '87 Brazilian model.

Grease nipples on the suspension links.

Specific handle bars and switches.

Plastic cover on the headlight stay carry over parts from RD350F (57V) from Europe

Fuel tap without diaphragm unit, ie fuel is gravity-fed through the tap (wich include a filter), rims partially painted and gold brake calipers on '87 Italian 2UA model made in Brazil and on brazilian models

Electrical switch on lateral stand (if you forget the stand, the engine stop when you put a gear) on '86 to '91 models for UK, Germany, Denmark, Sweden, Finland, Austria & '84 to '85 USA models

Fairing with twin head-lamp , remote-operated choke on left-hand lower panel fairing & exhaust with silencers removable with '83 31K cylinders , carburettors without power-jets like '83 31K & specific cylinder head wich do a compression ration of 5:1 for '91 to '93 Brazilian model

Fairing with twin head-lamp , remote-operated choke on left-hand lower panel fairing & restricted exhaust with different carb setting (extract from ), greaser on bottom suspension arm et suspension legs for '92 to '95 English, Italian & Spanish 4CE model (Made In Brazil)