How do I figure out what jetting to get
#1
I have a 2004 400ex and I'm getting a RS3 Yoshimura full system from someone that used it on a 400ex before me and I am not sure how to figure out what jetting I need for it to run good but I would really like to figure it out as soon as possible.
#2
We have the information you seek on the ATV Connection homepage, here:
https://atvconnection.com/articles/a...r-new-exhaust/
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