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Dirt Bike Brands - Other
XR 400 high altitude riding
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[QUOTE="VintageDirt, post: 117836, member: 21172"] [b]Not just jetting.[/b] If you are going to be riding that 400 on gnarly mountain trails, I'd suggest going one tooth smaller than stock on your countershaft sprocket. You'll be glad you did when the trail turns steep, tight, and rocky. I changed mine and it was the best mod I've made. Didn't even need to shorten the chain as the adjusters had enough travel to take up the slack. Sorry I can't help with the jetting. I have it all written down, but it's at home. Mine has the snorkel removed, uni filter, and a Baja baffle. I had to go to what seemed very rich on the slo jet to get rid of the off idle hesitation. If this thread is still going this evening I'll chime in with my jetting for 5000-9000 ft. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
XR 400 high altitude riding
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