crf 450 does different compression require different jetting?

I run a 04 crf 450 in the woods and was thinking of putting a lower compression 03 piston in the the bike to take away some hit and help with low speed stalling. I noticed the 03 honda comes much richer stock than the 04. It that because of the different compression/cam or what. Should I run my current 04 jetting(which is perfect) with the 03 piston ??????

well?

the different jetting comes form the different needle.

in general,if anything,the bike would want a leaner main jet to maintian the same A/F ratio with added compressio.

the change is so minimal you wont ahve to make any jetting changes.

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