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Jul 11, 2009 | 12:40 AM

#11

Beastly 3hundo

Pro Rider

Joined: Dec 2008

Posts: 306

Likes: 0

From: Mansfield Ohio.

I say 65-70. It's a Baja 1000 winning xr400 engine in a quad frame.

Jul 16, 2009 | 06:52 PM

#12

sprayedgt

Pro Rider

Joined: Dec 2008

Posts: 293

Likes: 0

From: Greenville, SC

I clocked my 2008 400EX at 64mph on my GPS wide open with a full Yoshi exhaust, UNI, choke removed, and timing advanced 6 degrees.

Jul 18, 2009 | 12:33 PM

#13

XtremeSkier

Elite Pro Rider

Joined: Nov 2004

Posts: 12,763

Likes: 0

From: Minnesota

i'd say b/t 60 and 65 stock..thats about how fast all the ones run that i've ridden with

possibilities are endless with mods..it all depends on how much u wanna spend and how fast u wanna go

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