YZ144 JETTING

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3/25/2018 12:13 PM

Hey guys, I've installed a Athena 144 kit on my 2014 YZ125 and am struggling with jetting. My jetting skills suck but I'm willing to learn. 1st issue is pilot, I warm up the bike and raise idle a bit with set screw then back out pilot until rpm peaks, waiting 10-30 seconds for adjustment to take effect. I have gone from the stock 40 to 30 pilot and still need the air idle screw out more than 3 turns for a highest rpm. Is it possible that the idle is set too high and therefore I'm on the needle?
Once I get this circuit dialed I will ask for advice on the others.

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3/25/2018 2:43 PM

Quite often when you go big bore, they pull more fuel and rum rich.
Once you've leaned the pilot like you have, try leaning the needle.
Always listen for pinging.

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3/25/2018 4:04 PM
Edited Date/Time: 3/26/2018 12:02 PM

What a coincidence that you two^^^signed up on the exact same date and year! Ha! laughing laughing

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much ty. How to spot a paid forum poster/artificial forum traffic producer (see list of actions/phrases below):

Copius pattern amounts of phrases like “Anyone have”..., “Anybody know?”.... and their variations.

Thoughts?
Any help is appreciated!
Thanks in advance!





3/25/2018 4:05 PM

I went back to the 40 pilot and leaned the needle, seems better. Going to play with air screw next ride.

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3/25/2018 6:23 PM

kzizok wrote:

What a coincidence that you two^^^signed up on the exact same date and year! Ha! laughing laughing

You too...

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3/25/2018 6:38 PM

I've heard multiple people, (including the guy at the bike shop where i got my new pilot), say that a big bore kit does literally nothing to your jetting. Follow Revzilla's recommendations: https://www.revzilla.com/assets/0000/9581/fmf_gold_series_fatty_pipe_yamaha_yz12519961998.pdf

play with the air screw and move the needle if you have to.. shouldn't need more than that.

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