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Dirt Bike Brands - Other
Xr 4 throttle respone ?'s
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[QUOTE="Reeko, post: 160322, member: 16284"] I had a 98 XR400 with the same stumble problem. Although I never thought the hit was excessive. It is ussually caused by a Lean condition when opening the throttle suddenly from idle. I think this is a 4 stroke thing that the YZs solve with an accelerator pump giving a shot of gas. A quick check tha proved to me it was too lean was to engage the choke 1/2 way and try it. It ran much better without the stumble for me. Then, a richer idle jet helped but never completely eliminated the problem. [/QUOTE]
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Dirt Bike Brands - Other
Xr 4 throttle respone ?'s
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