KX250 Throttle Response

M

Morvo

Member

Oct 31, 2005

205

0

• Jul 22, 2008

• #1

Sup,

Our 1995 KX250 seems to be experiencing throttle response issues in the low/mid range of the rev range. She starts fine, idles fine, doesn't smoke at all, picks up brilliantly and tops out to oblivion! But if you try and ease the throttle on or use half of the revs it just doesn't want to know about it, so it's either low revs where it's quite jumpy on the rev range or it's all out power! There's not really an inbetween, well, there is but not as smooth as I would like if you know what I mean?

What do you think would be causing this to happen? Bad fueling? Bad timing? Power valve problem? Normal operation of this bike? As I said before, it is by no means gutless and it tries to rip your arms off at full pelt, maybe I'm just being pedantic...

Ideas welcome,

Dan :nod:

 

IndyMX

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Jul 18, 2006

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2

Amo, IN

• Jul 22, 2008

• #2

Perhaps it's a bit rich on the needle?

 

M

Morvo

Member

Oct 31, 2005

205

0

• Jul 22, 2008

• Thread starter
• #3

IndyMX said:

Perhaps it's a bit rich on the needle?

Click to expand...

I can't remember the exact position of the needle in the carb but if I recall correctly I think I set it to a fairly lean position to overcome the old problem we had with the plugs fouling all of the time... Do you think maybe I should richen the mixture then or would this make things worse?

 

8

88'cr250r

Uhhh...

Jul 21, 2008

21

0

• Jul 22, 2008

• #4

should be in the middle if it is drop it one

 

M

Morvo

Member

Oct 31, 2005

205

0

• Jul 22, 2008

• Thread starter
• #5

88'cr250r said:

should be in the middle if it is drop it one

Click to expand...

Ok, so when you say drop it one do you mean to move the circlip down the needle or up the needle (I can't remember which way leans/riches).

And it is definately something to do with the needle you think, nothing else would spring to mind considering my circumstances?

Thanks for the speedy replies by the way, much appreciated :nod:

 

8

88'cr250r

Uhhh...

Jul 21, 2008

21

0

• Jul 22, 2008

• #6

yes move it down just one see what it does..always start with small things first instead of wasting unneeded $$$

 

M

Morvo

Member

Oct 31, 2005

205

0

• Jul 22, 2008

• Thread starter
• #7

Gotcha, I'll give that a go at the weekend then. Thanks for your help guys!

Dan

 

8

88'cr250r

Uhhh...

Jul 21, 2008

21

0

• Jul 22, 2008

• #8

no problem

 

IndyMX

Crash Test Dummy

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Jul 18, 2006

5,548

2

Amo, IN

• Jul 22, 2008

• #9

If you drop the clip lower on the needle, you are moving rich.. you should move the clip up to lean it.

 

M

Morvo

Member

Oct 31, 2005

205

0

• Jul 22, 2008

• Thread starter
• #10

Ahhh, conflicting issues now :) . So should I just go back to the centre and move it up one then? Basically, do you think it's because of overfueling that our bike is having this problem? I was always under the impression that the richer the mixture the more 'boggy' the throttle feels (which it isn't).