Should a KDX idle?

N

NM_KDX200

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Dec 29, 2002

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• May 9, 2004

• #1

1) does your KDX idle? For how long? Mine doesn't. It'll burble for a couple of seconds and then die. I think it's running rich. See next question.

2) If you open the airbox does the bike run richer or leaner? I'm thinking richer and therefore you need to use smaller jets.

 

Canadian Dave

Super Power AssClown

Apr 28, 1999

1,202

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• May 9, 2004

• #2

Q1 - Yes it should idle.

Q2 - No it will run leaner, more air = leaner jetting.

Check out http://www.dirtrider.net/justkdx/carbtuning.html and seach this forum for plenty of info to help you fine tune your jetting.

David

 

N

NM_KDX200

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Dec 29, 2002

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• May 9, 2004

• Thread starter
• #3

I printed that document out a long time ago, but when I open up my air box, it sure feels richer. Doesn't do the "lean bog" and I get more smoke out of the pipe. Oh well, I'll go play with it some more.

Likewise, with the idle- it feels rich. There's no "run on" and lots of smoke.

I'm at 6,000' elevation, 96 KDX200, FMF Torque pipe, ISDE silencer, stock air box cutout removed- now duct taped over. I'm running a 152 main, 42 pilot, needle all the way down (clip on the top). If I move the clip down one (raise the needle), it runs worse. Now, "worse" is actually pretty good once it gets warmed up, but I'm trying to make it run really clean and smooth all the way down. When I drop down to the Amarillo TX area (4,000), the bike runs like a champ.

 

Last edited: May 9, 2004

R

Rhodester

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May 17, 2003

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• May 9, 2004

• #4

Your pilot should probably be a 40 or maybe even a 38 at 6000'. I'd start with a 38 and air screw at 1 1/2 out. Fine tune from there.

 

B

Braahp

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Jan 20, 2001

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• May 9, 2004

• #5

You could probably even stand to have your head milled and dome reshaped to give you some higher compression.

 

N

NM_KDX200

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Dec 29, 2002

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• May 9, 2004

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• #6

Wait- I lied... the jetting is a 152 main, 42 pilot- I just went out and checked. Glad to know you think a 40 or 38 would be appropriate 'cause that's what I was thinking, too.

 

J

JasonWho

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Apr 10, 2002

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• May 10, 2004

• #7

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Last edited: Sep 17, 2004

N

NM_KDX200

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Dec 29, 2002

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• May 10, 2004

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• #8

JasonWho said:

Try a 40.

Click to expand...

I ordered a 40 and a 38, as well as a couple main jets of both sides of 152. When I leave the ranch to go riding somewhere else, I either go down 2,000' or up 2,000', so having both larger and smaller jets will be nice. I suspect the 40 will work well, since, like I said, when I drop down to Amarillo, the bike runs really well.

TIP: don't leave brass jets rattling around. I have some spare mains and the threads are all rounded off from bouncing around in a film can.

 

N

NM_KDX200

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Dec 29, 2002

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• May 15, 2004

• Thread starter
• #9

Results: I popped the 40 pilot and 150 main jet and the bike idles. Still a little rich, but it runs stronger off the bottom and warms up much faster. I think I'll move my needle back one notch and play with it some more.

 

J

JasonWho

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Apr 10, 2002

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• May 15, 2004

• #10

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Last edited: Sep 17, 2004

8

89kdx200rdr

~SPONSOR~

Apr 19, 2003

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• May 16, 2004

• #11

mine idles like it has fuel injection
i kick it (usually starts with one or two kicks) it idles fine with choke on then idles fine when i take choke off. :yeehaw:

 

C

canyncarvr

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Oct 14, 1999

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• May 17, 2004

• #12

re: '..like it has fuel injection.'

Not sure what that means. I hear a whole lot of cars at the local track that are injected that don't idle for diddle.

My tracker is fuel injected. It doesn't idle for diddle, either.

Maybe '..like...fuel injection,' is a bad thing?

You might check the nylon adjuster that adjusts the idle (by holding the slide in different positions in the carb bore). It can get 'goobered' (technical term) such that it doesn't perform its function.

Maybe your slide is sitting too low..not adjusted and not adjustable.

You didn't mention if the idle speed was correct while it is idling.

 

8

89kdx200rdr

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Apr 19, 2003

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• May 18, 2004

• #13

hey cc, i was refering to the fuel inj on my car. it idles great. so does the bike.

 

S

skipro3

Mod Ban

Dec 14, 2002

902

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• May 18, 2004

• #14

Braahp said:

You could probably even stand to have your head milled and dome reshaped to give you some higher compression.

Click to expand...

I agree. At that elevation, 6,000 ft., it would sure bring things back into perspective. For $40 Ron does a great job. Look up RB Designs and check his website. Describe your symptoms and he will recommend a solution. Just remember, if he gives you sound advise, have him do the work. He needs to eat too.
Ron did work on my bike's head and it really helped me out.

 

8

89kdx200rdr

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Apr 19, 2003

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• May 19, 2004

• #15

oh yeah he did my head and carb( actually a new airstriker) too. and the jetting he put in the carb was spot on. how'd he do that?

 

8

89kdx200rdr

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Apr 19, 2003

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• May 19, 2004

• #16

just kidding i know how he did it.