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04+JD Jetting Kit+CHM Jetting suggestions

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I just got the CHM exhaust for my 04 450. I already have the JD jetting kit installed. Any recommendations for a good place to start (or finish) for jetting?

The CHM instructions have the main suggested at one size larger than stock - but the JD kit is different - should I go one size larger than the JD kit recommends?

Probably around 800ft above sea level (whatever Sacramento, CA is).

Also for the occasional trail ride - what effect does the spark arrestor and quiet core have on the jetting?

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I have the same setup on my bike. Elevation is about 1,000 ft. Run whatever the JD kit suggests for your elevation. Put the pipe on and run it. Thats the setup that I've run all year. The bike rips. I have had no popping on decel or anything. I have had the screen out since the day I put the pipe on. Try what I suggest and give an update. Only other mods done to the bike are removing the backfire screen and a powernow installed. Good luck!

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