Honda CR250R Owner's Manual & Competition Handbook page 112

7. Change the main jet (5) and slow jet (6) as
required.
(6)
(5) main jet (6) slow jet
8. Check the O-ring for wear, then reinstall the
float chamber plug securely.
9. Remove the carburetor top, throttle valve and
cable holder (this page), and then change the
jet needle clip position as required.
10. Reinstall the jet needle, throttle valve, cable
holder and carburetor top (page 108).
11. Turn the carburetor upright and tighten its
clamp screws.
12. Adjust the air screw opening required.
Reconnect the fuel line at the carburetor.
13. Repeat steps 2 through 12 until the engine
gives maximum power with the correct spark
plug reading. It is always better to jet a little
rich than a little lean. It is advisable to
record the settings, course conditions, lap
times, and climatic and barometric conditions
for future reference.
Carburetor Disassembly/Assembly
1. Remove the fuel tank. (Page 30)
2. Remove the subframe. (Page 32)
3. Loosen the insulator band screw (1).
(5)
(1)
(1) insulator band screw
4. Disconnect the throttle sensor connector (2)
and remove the wire band (3) and clamp (4).
(3)
(2) throttle sensor connector
(3) wire band
(4) clamp
Carburetor Adjustments & Tuning Tips
(2)
(4)
5. Loosen the screws (5) and remove the
carburetor top (6).
(5)
(5) screws (6) carburetor top
6. Pull up the throttle position sensor arm (7),
then pull out the throttle valve (8) from the
carburetor body.
(7)
(7) throttle position sensor arm
(8) throttle valve
Adjustments for Competition
(6)
(8)
(cont'd)
107