Mike
The day my XR400 was stolen, 2 weeks ago, I rode a stock XR as well as my bike with the Mikuni and aftermarket exhaust. The Mikuni carburetor makes a great difference to the XR400 in throttle response. You can open it up from idle without any hesitation or misfire which is perfect for riding dunes.
Easier to start too I remember from my own bike. (The ‘stock’ XR I recently rode has electric start!)
Regards, Stephan
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