adamchatum

Member
Jun 17, 2007
7
0
Guys, I just bought a 2003 yz250 from the coast, it has a stock main jet right now thats been in there since new (178s). I live approx 416m or 1364 feet above sea level. Should I down size one or two sizes (175 or 172), and lower my needle clip a slot?
Thanks for your help.
 

SpDyKen

LIFETIME SPONSOR
Mar 27, 2005
1,237
1
Do a search for "jetting." You will find lots of good information.

Most threads suggest that you start with the pilot circuit, since it affects jetting at every throttle position. I suggest you start here as well.

You will be in for a treat! :cool:
 
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