FCR 39 jetting, What main jets is everyone running with 400ex race quads?

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Mar 26, 2002 | 12:56 PM

eskimo400

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Weekend Warrior

Joined: Jan 2002

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Im about sea level and running .080 over 12.5/1 piston and cam and port work. I have tried up to 185 but it seems to hurt the top end. I now run a 168 but the plug never colors at any jet range with race gas. What do you do?

Mar 26, 2002 | 08:43 PM

coolinthewoods

Pro Rider

Joined: Oct 2001

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Have you done any air box mods? and were do you live in Alaska, Im in Fairbanks.

Mar 27, 2002 | 09:48 AM

eskimo400

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Weekend Warrior

Joined: Jan 2002

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I run a straight KN, no air box

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