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CRF 450x jetting

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Want to readjust carb and/or re-jet to get rid of the popping. Sounds like these bikes (2005) run a little lean out of the box. I'm not interested in more power so I plan on using the stock exhaust. I just want it to run as cool as possible and run well.

Are these bike set up from the factory so lean it's harmful? Can I get away with tuning the existing jets to get a more rich run or should I get the JD kit and go that route? I live in So Cal so I ride from about 1200-5000 foot range. I don't plan on doing anything major as far as engine mods. Any input would be helpful. Thanks Mike

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block off the air injection before trying to jet the bike.the air injection contributes greatly to the popping.

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Thanks for you reply. If I could ask another stupid question. How do you block off the air injection?

Mike

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blocking the smog will make it run 100% better!!! take the restrictor out of the exhaust also. that thing comes stock with a 142 main and i just put a jd kit in my scooter and the main was bumped up to a 165. Its nice now.

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Thank You.

My bike is running great 100% stock except for a few pops on deceleration so no big deal. But I have just bought a JD Jetting kit and TwinAir Powerflow kit will they give me more ponies or should I leave a great running stock bike alone?

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