Sounds like the pilot may be clogged to me.... where do you have the air screw set?
2008 YZ250 build
Started by
AJMAG247
, Dec 14 2011 06:00 PM
515 replies to this topic
Posted 12 March 2012 - 02:35 PM
Sucks going back and forth between carb and Fi... Forgot there was the screw with the nut on it, idles now. I have a 420 main and stock needle second clip right now an stock pilot. That's wha worked best last year does that sound good or nah?
Posted 12 March 2012 - 02:44 PM
Yea that should be really really close. Id say your def safe from any melt downs... Im thinking you should be more towards the 3rd clip pos. with A/S about 2 turns out. 2nd clip may be pretty rich. stock is 4th clip pos.
Posted 12 March 2012 - 03:06 PM
air screw is 2.5 i think maybe 2 i gotta double check but it sounds gooood
Posted 12 March 2012 - 03:23 PM
Sounds really good... Id ride it as is. If you get a bog or hesitation after 1/3 throttle you'll know that you need to drop the needle one clip.
2.5 turns out on the air screw means you need to drop the pilot one size. You should be over 1 turn out and under 2.5, meaning 2.5 and above you need to drop the pilot one size. Under 1 turn out you need to raise the pilot one size.
2.5 turns out on the air screw means you need to drop the pilot one size. You should be over 1 turn out and under 2.5, meaning 2.5 and above you need to drop the pilot one size. Under 1 turn out you need to raise the pilot one size.
Posted 12 March 2012 - 04:47 PM
ah gotcha well its at 26:1(for break in) mix right now so once i drain this and put the 32:1 in there and set it up for that ill see how it is. thanks for the tip man! cant wait to ride these things forgot what they feel like 
Edited by AJMAG247, 12 March 2012 - 04:54 PM.
Posted 12 March 2012 - 04:52 PM
No prob man... Ive done my fair share of jetting work on these Yz's. They are very finicky but pretty simple once you get the hang of it. If you need any help let me know.
Edited by BDubb106, 12 March 2012 - 04:54 PM.
Posted 13 March 2012 - 06:14 PM
packed up read to get some ride time on this bike tomorrow! hopefully i dont have to do any jetting at the track, thats the worssst lol
Edited by AJMAG247, 13 March 2012 - 06:14 PM.
Posted 13 March 2012 - 06:16 PM
I know man... my bike wont rev above 1/2 throttle so I have no idea whats goin on with it
Posted 13 March 2012 - 07:34 PM
BDubb106, on 13 March 2012 - 07:23 PM, said:
Whats wrong with the 125? I feel like a noob mechanic again, cant get the 450 to start after a rebuild and now the 250 has issues after a rebuild. Wondering whats gonna be next.
It's got a nasty bog a soon as you give it gas (only when riding). It runs good mid/top but there is zero bottom end (I know it's a 125 and isn't supposed to have much bottom end). Like i literally have to give it half throttle and constantly feather the clutch just to get it going. I've gone down a few sizes in jets and tried a few diff clip positions but still not much better. My powervalves need to be replaced cause they keep falling apart and disconnecting. But my 450 runs good
.
Edited by KJK_JR, 13 March 2012 - 07:38 PM.
Posted 13 March 2012 - 07:47 PM
Your PV probably isnt closing all the way, thats what it sounds like to me. I had the same issue when I rebuilt my 00' 125. Replaced the springs and it ran fine after that.
Posted 14 March 2012 - 09:49 AM
Haha... what did I tell ya man. The 250 is a beast!
How was jetting? Did you have to adjust at all?
How was jetting? Did you have to adjust at all?
Posted 14 March 2012 - 02:17 PM
Just a half turn in on the air screw it was mint i has to leave a little early i felt a migrane comin on and still had to drive home but i got a decent video
Posted 14 March 2012 - 05:18 PM
video came out pretty good, still getting used to where to shift and how the bike handles but again FC did an amazing job on this thing and this bike loves to get thrown around lol. but man this thing just doesnt sing on video like the 125 does sounds good tho. ill post it as soon as its done uploading
