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Gordon's mods, jetting XR400 2001

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Ok, so those of you who are familiar with gordon's mods. I am going to be doing them on my 2001 xr400. My bike has very low miles and is in great condition. Here is what I'll be doing.

-Removing air box snorkel

-Upgrading to uni dual stage foam filter

-Drilling three 7/32nds holes in the baffle of the muffler

-Grinding welds on the muffler just like gordons mods

Now, I would be doing most of my riding at a ballpark of about 4500ft elevation.

What would be a good jetting for this type of set-up?

I run premium fuel, don't know if that makes a difference, prolly not.

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