Question about 2003 Yamaha YZ 125
Ive fitted a new pilot screw (or air screw) on the carb of a yz85 2005 what is the correct setting for it starting from being screwed right in as far as it will go.i do understand all bikes are set up differantly and i can play with it once its running but i would like to no what is the correct starting point.
Stock it would be around 2 turns out.
These bikes shipped with only one jet needle (unlike other Yamaha's) the bike's factory jetting is 45 pilot, NBKF needle on the 2nd clip from the top, and 138 main. This bike tends to run a little rich off the bottom, so I'd recommend running a 42 pilot instead. When it's really hot out (over 90) you can run the 135 main jet.
Screwwing with carbs is fact of life with these bikes - you will have to do some tweaking no matter what.
Posted on May 13, 2010
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Posted on Jan 02, 2017
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