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YBRIK
12-18-2006, 03:20 PM
I HAVE A 07 400EX PRO CIRCUIT SLIP ON NO OTHER MODS I LIVE IN INDIANA ABOUT 650' ASL IM GETTING READY TO ORDER (KEIHIN) JETS. DOES THIS SOUND ABOUT RIGHT???REMOVE CHOKE,155MAIN,42 PILOT. I DONT THINK 07 WILL HAVE A NEEDLE ADJUSTMENT SO I'LL LEAVE IT ALONE. ALSO WHAT SERIES PILOT 26 OR 21? LONG HEX MAIN RIGHT? THANKS
blasterandy
12-18-2006, 03:27 PM
152 would probably be a good size, i would get a 42pilot, 152,155,158,160, That way you are good for all setups (i.e. w/-w/o abLid, if you get an air filter, or heat/humidity changes.
YBRIK
12-18-2006, 03:38 PM
I CAN LEAVE NEEDLE ALONE RIGHT?
hornetgod13
12-18-2006, 06:28 PM
Originally posted by YBRIK
I CAN LEAVE NEEDLE ALONE RIGHT?

2005 and Up 400EX's have a non-adjustable needle. It has only 1 position. You'll have to buy a DynoJet Kit which includes a adjustable needle, 9 jets, and the "D" shaped fuel screw you'll need for your quad for $45.00-$55.00 or just buy a 1999 to 2004 needle for $30.00
YBRIK
12-19-2006, 06:43 PM
CAN I GET BY WITH THE STOCK NON AJUSTABLE NEEDLE AND DO THE PILOT AND THE MAIN??? I'D RATHER NOT MESS WITH NEEDLE IF POSSIBLE ...
hornetgod13
12-19-2006, 06:50 PM
Originally posted by YBRIK
CAN I GET BY WITH THE STOCK NON AJUSTABLE NEEDLE AND DO THE PILOT AND THE MAIN??? I'D RATHER NOT MESS WITH NEEDLE IF POSSIBLE ...

STOP SHOUTING! (All capital letters)

Yes you can but, if the mid throttle range starts acting funny it will be time for an adjustable needle. I know several people that don't even mess with the needle setting and just change Pilot and Main jets.
YBRIK
12-19-2006, 07:00 PM
THANKS!!! I'LL BUY AN 04 OR EARLIER NEEDLE IF MID ACTS FUNNY
GPracer2500
12-19-2006, 08:21 PM
The stock pilot jet is a Series 26. The more common Series 21 works fine though. Not sure why everyone around here seems to automatically recommend a 42 pilot jet. I suspect a 40 is the appropriate jet for many people [shrug].

About the needle: a non-adjustable needle can be shimmed up using small washers. This works when a 1/2 clip position adjustment is desired on adjustable needles too.
YBRIK
12-19-2006, 08:47 PM
OR HOW ABOUT I PUT A 152 OR 155 MAIN AND 3 TURNS OUT W/FUEL SCREW(ABOUT 15 MINUTES WORK) AND JUST RIDE IT
GPracer2500
12-19-2006, 09:02 PM
Originally posted by YBRIK
OR HOW ABOUT I PUT A 152 OR 155 MAIN AND 3 TURNS OUT W/FUEL SCREW(ABOUT 15 MINUTES WORK) AND JUST RIDE IT

That might be just fine. It just depends on all the multitude of factors that affect jetting and how adament you are about getting the jetting as close to correct as possible. Doing the above is quick, easy, and certainly better than doing nothing.