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brian400ex
06-08-2002, 10:26 AM
I have a stock 400ex with a T4 slipon. No other mods to the engine. I went up one size in the main jet. The spark plug looks white. Is the jetting correct you think? The air box is stock.

Thanks
Tlongs400
06-08-2002, 11:51 AM
sounds real lean dude, bump it up a few more sizes
MichaelS693
06-08-2002, 12:02 PM
your to lean

white = lean- go up jet size
black = rich- go down jet size
chocolate = just right- leave it alone
06-08-2002, 05:16 PM
yeah it sounds alittle lean
R-Crazy
06-08-2002, 06:04 PM
my plug has black on the put side and grey on the electode. is that good?

dave
R-Crazy
06-09-2002, 11:13 AM
sorry, it is black on the threads and grey on the electode. does that sound right?

dave
MichaelS693
06-09-2002, 12:27 PM
sounds like you are a tad bit lean
R-Crazy
06-09-2002, 02:29 PM
how much should i go up?

dave
MichaelS693
06-13-2002, 10:28 PM
one size