400EX Speed
#1
#4
I have a FMF Powercore IV pipe, K and N filter with a dyno-jet jet kit. I also drilled a couple of holes in my air box. As for an increase in mph, I don't think that there is much of a difference compared to a stock 400ex. If there is then yeah, its probably only 1 or 2 mph more than a stock 400ex. However the mods that I have done to my 400ex gives it way better acceleration, torgue, and of course horsepower. I can pull away from stock 400ex's by a good 3-4 quad lengths and they can't catch me. So I honestly don't think that it is a major top speed increase, its just much better acceleration, torgue, and horsepower.
As for the top speed of a stock 400ex. I agree, Dirt Wheels Magazine says that a stock 400ex runs a top speed of 68mph.
Fourtracker14
As for the top speed of a stock 400ex. I agree, Dirt Wheels Magazine says that a stock 400ex runs a top speed of 68mph.
Fourtracker14
#6
If you want to figure the top speed just use this and fill in the numbers:
http://home.earthlink.net/~gellett/400ex.htm
http://home.earthlink.net/~gellett/400ex.htm
#7
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