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HRC Setting Data & Maintenance Information


RS250R Parts Combination according to model years


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The RS racer has undergone yearly improvements since its debut. Accordingly, the specifications slightly vary with each year. 
If parts or components specified for particular model year are not installed on a machine, defective setting will result, leading to degraded performance or failures.


Combination of RS250R parts


Parts name          Criteria                   '97                  '98                  '99                   '00                     '01
Cylinder               Cylinder stamp       Head No.6       Head No.7       Head No.8        Head No.9          Head No.0
Cylinder head       Cylinder stamp       G                    G                    J                      J                       J
ECU                    Type No.                CI550B           CI550B            CI550C             CI550C              CI550E
Carburetor           Carburetor Stamp                                                09BA/09CA       09EA/09FA       09GA/09HA


Criteria for each part 
1) Cylinder
    Cylinders should be identified by the initial digit of 8-digit stamped numbers located to the left when the exhaust side is faced forward. 

    Basically, it should be the first digit of the model year plus one (1).
    Example: If stamped numbers are "8GY1D075", appropriate cylinders can be identified as the first digit of 8 plus 1 or 9, which means 1999 model year.



2) Cylinder head
    There is a stamp in the white circle indicated in the photo below.
    "G" refers to those for the '97 and '98 models without power jet carburetors.
    "J" refers to those for the '99 and later models with power jet carburetors.
    The head stamped with "G" has a volume of about 11.3cc while the head stamped with "J" has a volume of about 12cc. 

    If the particular head does not meet its model year and machine specifications, problems including frequent detonation may result. 
    Extreme care should be exercised.
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3) ECU
The ECU should be identified by the model number [CI###] written in white placed below the body. 



Year     Model.          Parts No.               Remark
'97        CI550B         30400-NX5-771       Unleaded fuel 
'98        CI550B         30400-NX5-771       Unleaded fuel
'99        CI550C         30400-NX5-791       Unleaded fuel/Pwj
'00        CI550C         30400-NX5-791       Unleaded fuel/Pwj

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4) Carburetors
 
Year      Cylinder      Parts No.               mark         Specification


'99         #1              16101-NX5-791       09BA        MJH BODYø3.7 Float level 8.0mm

             #2              16102-NX5-791       09CA        MJH BODYø3.7 Float level 8.0mm

'00         #1              16101-NX5-681       09EA        MJH BODYø3.7 Float level 8.0mm

             #2              16102-NX5-681       09FA        MJH BODYø3.7 Float level 8.0mm

'01         #1              16101-NXA-003      09GA        MJH BODYø3.7 Float level 8.0mm

             #2              16102-NXA-003      09HA        MJH BODYø3.7 Float level 8.0mm

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The MJH BODY in the table above refers to the carburetor side which is fitted with MJHs (hole diameter of 3.7mm).
Stamps circled by white letters in the photo should make identification.


Settings for each model year 

Model year      Features                                                 Settings

'97-'98             Unleaded fuel/PJ carburetor                       Peak power oriented settings (max speed of around 13000rpm)
                                                                                     If detonation occurs frequently in winter, ignition timing is delayed.


'99-'00             Fitted with Pwj carburetors                        Settings reflecting engine revving characteristics after Pwj becomes ineffective.
                                                                                    Maximum service speed: around 13750rpm
                                                                                    Middle ranges become strong when mixture is made richer until hunting occur during throttle on.


'01-                 Full face lift(NXA)                                      Peak power oriented settings.(max of around 13300rpm)
                                                                                    Unlike '00 model, not revving characteristics after Pwj becomes ineffective. 

                                                                                    Earlier shift ups and aggressive use of peak speeds.

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SP125 Limited
22 Walker Wood,  Baildon,  Shipley,  West Yorkshire,  BD17 5BE,  England
Telephone 01274 583231      steve@sp125racing.com      Mobile 07738 626165
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SP125 Limited Disclaimer
Honda, HRC and all other parts supplied by the SP125 Limited are not guaranteed when used in competition events.
As such, it is a condition of our making all parts available that it is solely the decision of each individual, rider, team member or 
team whether they choose to use any part supplied and in doing so, absolve the manufacturer and SP125 Limited of any or all 
such claims, including damage to equipment and/or injury to personnel irrespective of how caused.

All parts remain property of SP125 Limited until paid for in full.

All 'special order' parts, that are ordered specially under the instruction of the customer, are non returnable and non refundable.
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