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View Full Version : 400ex headpipe



n811
03-03-2007, 08:50 PM
Has anyone done any mods or spacers to their stock headpipe? Those aftermarket ones cost so much. I put a spacer on my girlfriends polaris 250 and got LOTS more bottom end. Wondered if it could be done on a 400ex?

03-03-2007, 08:56 PM
what do you mean you put a spacer on it?

zrpilot
03-03-2007, 09:04 PM
I'll bet the Pol 250 was a 2 stroke? If so, that makes some sense by changing the expansion chamber characteristics.

n811
03-03-2007, 09:06 PM
I used a exhaust donut from a toyota or some import car. I got it from a service station that my brother was working at. it was cone shaped on both ends so it fit into the manifold and the pipe creating a spacer.

n811
03-03-2007, 09:06 PM
Ya its a 2 stroke

joshyz125
03-06-2007, 04:44 AM
Spacing the 4 stroke head pipe won't do anything for it.

You can dremel the weld just inside the head. Don't grind it al the way out, There's Alot of extra Non-needed material there.

04450rrider
03-06-2007, 06:59 AM
I have a 400ex header i could sell you. I dont have any use for it anymore since i sold my 400ex.