Question about 2002 Honda CR 250 R

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2002 Honda CR 250 R carburetor tuning

Looking for carb settings for a 2002 honda cr250 at an elevation of sea level to 2000 ft. I have the needle 2 spots up from the bottom, average temp is between 50 and 75. I installed a 370 main jet and moved the needle down because with a 380 main it was still too rich with the needle from the top clip position. is a 370 main too lean? do I need to change the pilot jet if I changed the main?

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  • yadayada
    yadayada May 11, 2010

    sea level adjustements are good to 4,000 feet, after that the carb would be calibrated for high altitude, that is jets sizes and mixture adjustments

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  • Honda Master
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Hi, Lymangroverg if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Posted on Jun 26, 2017

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Posted on Jan 02, 2017

  • 142 Answers

SOURCE: I'm 5400 ft and running a 490 main jet. the plug

try a cooler range plug with the same jets and see w

Posted on Jun 02, 2009

  • 66 Answers

SOURCE: main jet and needle setting for 2003 honda cr250 at 5000 ft elev.

this should get you close, will still have to fine tune due to exacting conditions.....humidity, temperature, pipe, silencer and reeds....however try this:

Main 360
Pilot 20
Needle H1-70
Needle Top Clip
Air Screw 2 Out



Posted on Oct 08, 2009

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Main jet and needle setting for 2003 honda cr250 at 5000 ft elev.


this should get you close, will still have to fine tune due to exacting conditions.....humidity, temperature, pipe, silencer and reeds....however try this:

Main 360
Pilot 20
Needle H1-70
Needle Top Clip
Air Screw 2 Out



Oct 08, 2009 | 2003 Honda CR 250 R

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