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Africa Twin RD04 XRV750 - Engine Restriction Details

It would appear that the restriction modifications can be ascertained on engine number alone, but only on Austrian and German models. Bikes for the Swiss market were also restricted but their engine numbers are in sequence with the full power models, just to make things difficult.

Also, the Honda Area (Market) Codes are my best guess. Again, if you know better then let me know.

Production years 1990 - XRV750L, 1991 - XRV750M and 1992 - XRV750N, RD04 750cc.

Full Power models for markets B (Belgium), E (England), F/YB (France), G (Germany), H (Holland), It (Italy), ND (Netherlands) and SP (Spain).

Full Power model produced for market AR (Austria) in 1990 only.

Restricted Power models for markets AR (Austria, 1991 and 1992), G/50P (Germany) and SW (Switzerland).

All models have the same CDI unit, the only changes were to the camshafts and the Inlet Rubbers. There are also carburettor changes to the restricted market models.

I will start by listing the standard part numbers -

Camshafts, Part Nos, Front: 14110-MV1-000, Rear: 14120-MV1-000

Inlet Rubbers, Part No: 16211-MN8-750

CDI Unit, Part No: 30410-MV1-003

Carburettors, Part Nos: Front/Right - 16101-MV1-630, Left/Rear - 16102-MV1-630

Main Jet Front/Right: #118, Part No: 99101-393-1180

Main Jet Left/Rear: #122, Part No: 99101-393-1220

Slow Jet: #42, Part No: 99103-437-0420

Front/Right Needle Set, Part No: 16151-MM9-621

Left/Rear Needle Set, Part No: 16151-MV1-700

Front/Right Holder, Needle Jet, Part No: 16165-MF5-671

Left/Rear Holder, Needle Jet, Part No: 16165-MV1-630

Plate Set, Valve; Part No: 16050-MS9-004

Piston Comp, Vacuum; Part No: 16112-MB6-881





Restricted models.

Market - Austria (Honda Area Code "AR"). Note: for years 1991 and 1992 only, NOT for 1990.

Restriction on camshaft only. Carburettors changed for 1991 and 1992.

Engine Nos: RD04E-5000001 to 5000329 for 1991 and

Engine Nos: RD04E-5100001 to 5100346 for 1992

Camshaft Part Nos, Front: 14110-MS8-000 and Rear: 14120-MS8-000

Carburettor Part Nos: Right/Front - 16101-MV1-880, Left/Rear - 16102-MV1-880

Changes to individual components are -

Main Jet Front/Right: #120, Part No: 99101-393-1200

Slow Jet: #38, Part No: 99103-MT2-0380

Front/Right Needle Set, Part No: 16131-MS8-004

Left/Rear Needle Set, Part No: 16151-MS8-681

Left/Rear Holder, Needle Jet, Part No: 16165-MF5-671

Plate Set, Valve; Part No: 16050-MS9-004

Piston Comp, Vacuum; Part No: 16112-MN8-752



Market - Germany (Honda Area Code "G/50P")

Restriction on inlet rubbers only.

Engine Nos: RD04E-3000001 to 3002245 for 1990,

Engine Nos: RD04E-3100001 to 3101536 for 1991 and

Engine Nos: RD04E-3200001 to 3201605 for 1992

Inlet Rubbers (called "Insulator, Carburetor" by Honda), Part No: 16211-MS9-710



Market - Switzerland (Honda Area Code "SW")

Unlike the Austrian and German models, Swiss bikes CANNOT be determined from Engine Number.

Restriction on camshaft AND inlet rubbers. There are carburettor changes also.

Engine Nos: RD04E-2000040 to 2006085 for 1990,

Engine Nos: RD04E-2100022 to 2105791 for 1991 and

Engine Nos: RD04E-2200010 to 2202882 for 1992

Camshaft Part Nos, Front: 14110-KW0-000 and Rear: 14120-KW0-000

Inlet Rubbers (called "Insulator, Carburetor" by Honda), Part No: 16211-MV1-640


Carburettor Part Nos: Right/Front - 16101-MV1-640, Left/Rear - 16102-MV1-640 for 1990 only.

Carburettor Part Nos: Right/Front - 16101-MV1-860, Left/Rear - 16102-MV1-860 for 1991 and 1992.

Changes to individual components are -

Main Jet Front/Right: #120, Part No: 99101-393-1200

Slow Jet: #38, Part No: 99103-437-0380 for 1990 only.

Slow Jet: #38, Part No: 99103-MT2-0380 for 1991 and 1992.

Right/Front Needle Set, Part No: 16131-MS8-681

Left/Rear Needle Set, Part No: 16151-MV1-640 for 1990 only.

Left/Rear Needle Set, Part No: 16151-MV1-860 for 1991 and 1992.

Left/Rear Holder, Needle Jet, Part No: 16165-MF5-671

Plate Set, Valve; Part No: 16050-MK7-771

Piston Comp, Vacuum; Part No: 16112-MN8-752



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Thanks for the posting. Ive just started doing the sums to refirbish my old RD04 and if the info can get its power up, thats heaps better. But can I check, as you have listed

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Quote: All models have the same CDI unit, the only changes were to the camshafts and the Inlet Rubbers. There are also carburettor changes to the restricted market models.

I will start by listing the standard part numbers -

Camshafts, Part Nos, Front: 14110-MV1-000, Rear: 14120-MV1-000

Inlet Rubbers, Part No: 16211-MN8-750

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Does that mean that I will need to change to the below parts to de-restrict it?
Camshafts, Part Nos, Front: 14110-MV1-000, Rear: 14120-MV1-000
Inlet Rubbers, Part No: 16211-MN8-750

Inlet rubbers are ok, but abit concern that the lift of the cams may cause the valve to crash onto the piston crown. Do you know if the derestricted cams are longer duration ones of high lift ones? any problems encountered. Thanks so much
 

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Good post! Do you know anything about restrictions to bikes for the Japanese market? I have a 1991 RD04 from Japan.
Thanks.
 

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Discussion Starter #4

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Hi, thanks for replying. I have the frame and engine numbers.
Frame - RD04-10000XX
Engine - RD04E-10000XX

Apart from that, nothing. I bought the bike in Moscow and it was imported from Japan.

Thanks.
 

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Heya,

Has anyone priced up, even ball park, the cost of derestricting an AT? It's gotta be at last 300 quid no? to gain 10% more horses?

So many mods, so little money :(
 

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Hello,

Can anyone confirm that the following chassis no. is restricted to 50 ps: RD043100877?

As far as I can tell it should be an M, G(50ps) model, and therefore restricted by inlet rubbers only. Presumably I would have to re-jet the carbs, if I change the insulators?

While the question above is old, to answer it, I guess it depends greatly on your model, and how it is restricted. If it is simply a question of re-jetting the carbs and changing (or boring out) the carb insulators, it shouldnt cost more than 100gbp, possibly quite a bit less.
 
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