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View Full Version : Main jet suggestion?



gel1197
04-22-2008, 09:36 AM
I have a 2005 trx 400 ex with the following non-oem stuff:

-K&N filter
-Custom aluminum airbox (professionally built) with the battery moved inside and the air box lid still on
-Phoenix custom 2 inch exhaust insert end cap (it has a screen for a spark arrestor but no baffles)
-13 tooth front sprocket

I live in Central Florida and ride woods/ trails only. The end cap manufacture states to bump up the main jet to a 155 with a stock air box and lid. Since it has the K&N what should I do? Should I just switch the main or do I need to do something else.

By the way the airbox is awesome...it's from cfm performance on E-bay and the quality is great. Not some cheesy little trash box

gel1197
04-23-2008, 04:47 AM
Does anyone have a suggestion?

redrocker
04-23-2008, 08:03 AM
Start at 160 main
My wifes bike I run 165 main
it runs great In So Cal.
stock pilot