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PLEASE HELP(jetting issues) Jd jet prb

This is a discussion on PLEASE HELP(jetting issues) Jd jet prb within the 4-Stroke Motorcycles - KTM forum, part of the 4-Stroke Motorcycle Forums category; I just put my jd jet kit in my 2007 250sx-f and it sucks.The recommended jetting and fuel screw setting ...

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  #1  
Old 08-09-2008, 01:51 PM
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Exclamation PLEASE HELP(jetting issues) Jd jet prb

I just put my jd jet kit in my 2007 250sx-f and it sucks.The recommended jetting and fuel screw setting boggs BAD!!!It has more power and idles well but if I crack the throttle it wont really even bog it will just die.PLEASE HELP!!!I want to die

I am at sea level with #185 main,red needle with clip in #4 position.HELP!


EDIT: Just tried needle in 5th position and didnt do anything.

EDIT: moved the clip up 1,didnt work,then down on from the previous position and got a little better.
Some one has got to know how to fix these problems!!

Last edited by ktm_cody_199; 08-09-2008 at 05:32 PM.
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  #2  
Old 08-09-2008, 09:09 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

kinda sounds like yer too rich...
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Old 08-09-2008, 09:19 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

I'd go down on that main jet. Maybe two sizes down. Keep an eye on your plug color so you don't lean it out.
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Old 08-09-2008, 09:23 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

How would I solve that,I have never jetted a carb in my life and I think I am starting to understand it from some research on google.I put the clip in the verry last position on the needle and bog is almost gone?What does that mean?Tommorow I am going to put the stock needle in and play with that some.I also adjusted the acp timing screw and that helped some as well, My fuel screw is 2 1/5 turns out from stop and I have #60 leak jet if that helps.Maybe a diff Main or Pilot?I am ganna research it some more.Starting problem is gone and has lots of midrange and top end,What jet controls the low end snap?
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Old 08-09-2008, 09:24 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

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Originally Posted by Freak View Post
I'd go down on that main jet. Maybe two sizes down. Keep an eye on your plug color so you don't lean it out.
What will that do?It had a #175 in it Stock.
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Old 08-09-2008, 09:34 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

the more you go down the clip on the needle, the more it leans it out. If your bike is starting fine and idles fine, I would not mess with the pilot. The main jet runs about 1/4 throttle and on up. So if the bike is running fine with 1/4 or less, your pilot is ok.
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Old 08-09-2008, 09:36 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

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Originally Posted by Freak View Post
the more you go down the clip on the needle, the more it leans it out. If your bike is starting fine and idles fine, I would not mess with the pilot. The main jet runs about 1/4 throttle and on up. So if the bike is running fine with 1/4 or less, your pilot is ok.

OK,so jd reccomending a #185 main may have been to rich.and say a 180 may be right?Or a stock 175 with the clip in a diff position?
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Old 08-09-2008, 09:37 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

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Originally Posted by ktm_cody_199 View Post
What will that do?It had a #175 in it Stock.

Try a 172 main and move the clip back up a notch or two. Please keep an eye on plug color. Check this link for some good plug color pics. I think way to many smoker guys neglect plug color. [Only registered and activated users can see links. ]
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Old 08-09-2008, 09:39 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

If you got the 175, try it.
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Old 08-09-2008, 09:43 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

Ok, your running a 185 now. Go one or two sizes down from that. It's best to go one size down at a time. Too big of a jump and you could lean the bike out and blow your engine. Just keep a close eye and that plug color.
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  #11  
Old 08-09-2008, 09:44 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

Quote:
Originally Posted by Freak View Post
Try a 172 main and move the clip back up a notch or two. Please keep an eye on plug color. Check this link for some good plug color pics. I think way to many smoker guys neglect plug color. [Only registered and activated users can see links. ]
That guide REALLY helps because I also have a 04 125sx (retired) that after looking over the guide is running lean (plug 28 looks just like it) Havent looked at my sxf plug But now I will Thanks!!
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Old 08-09-2008, 09:46 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

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Originally Posted by Freak View Post
If you got the 175, try it.
I am ganna try the 180,then the 175 and see wich is best.Where should I put the clip at and wich needle Should I use with either jets? or should I do the trial and error like I have been
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Old 08-09-2008, 09:48 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

No problem bro. Some jetting gurus may step in here later and give better advice. Best way to tell plug color is a WOT chop.
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  #14  
Old 08-09-2008, 09:50 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

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Originally Posted by Freak View Post
No problem bro. Some jetting gurus may step in here later and give better advice. Best way to tell plug color is a WOT chop.
You have no Idea how much this helps,I was playing with my needle when I should have gone down on the main.Why would JD reccomend such a rich main?
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  #15  
Old 08-09-2008, 09:51 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

Quote:
Originally Posted by ktm_cody_199 View Post
trial and error like I have been
yup, it's a crap shoot bud. Pull that plug now and take a look, should give you a really good idea where your jetting is right now.
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  #16  
Old 08-09-2008, 09:53 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

Quote:
Originally Posted by Freak View Post
yup, it's a crap shoot bud. Pull that plug now and take a look, should give you a really good idea where your jetting is right now.
Usually I just pull the plug every few rides and do the......Wooooow Junk, and throw it away
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Old 08-09-2008, 09:54 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

Quote:
Originally Posted by ktm_cody_199 View Post
Why would JD reccomend such a rich main?
It's just a general place to start. Sometimes there right on, sometimes there way off.
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  #18  
Old 08-09-2008, 10:01 PM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

O and can anyone tell me how to swich my avitar from begginer class?I am a B rider.
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Old 08-10-2008, 10:24 AM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

Quote:
Originally Posted by tirebiter View Post
The lower you place the clip on the needle, the richer it gets.
Most bog problems are pilot/fuel screw/AC pump related, not necessarily main jet.

tanks tirebiter,I believe I have a 45 pilot and I am going to put the 180 main in right now with the clip in the middle position on the red needle and try that.If that dont work I will try the blue needle then the stock needle if all else fails, I have the red JD fuel screw.
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  #20  
Old 08-11-2008, 11:00 AM
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Default Re: PLEASE HELP(jetting issues) Jd jet prb

Just put the #180 main in it and it does NOT die any more but there is still a bog but not nearly as bad.I also played with the fuel screw and it also helped some.I am going to lower the clip some and see how it is then raise it and if that dont work I will change the needle.Thank you for the help tire biter,the bog is going away!!

BTW,this bike never had real good jetting before and I learned to ride it from mid to top with out utilizing bottom end power.Now with the jetting coaxing out the low end,This bike rips all the way from bottom to top and accelerates FAST!!
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