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View Full Version : Jetting with new Pro Circuit T4 (with Plug Pics)



timewass
08-08-2002, 06:15 AM
I just got a new Pro Circuit T4 Slip-On and love the power it has as well as the sound. My concern is that I am running lean.

My altitude is around 1500 - 2000 feet and I'm in western PA.
My 400 EX is completely stock except for the Pro Circuit T4 and a 150 main jet. Everything else is stock.
I have included a link to pics of the plugs. They are the same pics, just different views. The plug on the left is my plug before any pipe mods. Just with the 150 main and stock pipe. The Plug on the right is my plug now with the T4 and a 150 main jet. I was thinking of going to a 155 main, but wanted some advice first.
Thanks

Plug Pic One (http://photos.yahoo.com/bc/bwilliamson400ex/lst?.dir=/400EX&.src=ph&.view=t)

flaneledholes
08-08-2002, 01:59 PM
I gotta say a 150 is way lean... Try a 155-160 that should put you about right...

Wheelie
08-08-2002, 02:14 PM
A #152 or a #155 should do the trick.