new to the forum with an 89 kdx 200 and idle issues.

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new to the forum with an 89 kdx 200 and idle issues.

Postby Budget_89KDX » 08:09 pm Oct 01 2010

I recently acquired an 89 kdx200 with a broken jet needle.I replaced the bgn with a bgp and it runs great plug is nice cardboard color.the problem I'm having is the bike surges up and down slightly at idle.I've adjusted the idle and a/f mixture but it either idles to high or too low and bogs when you rev it.now for the info i have the bike was recently rebuilt by the previous owner.I did a compression test and its got 190psi,there's a dyno port header,pro circuit silencer,boysen reeds,uni filter 45/158 jetting and a bgp jet needle second clip from the bottom.I've checked the kips by reving it to 6k rpm and the rod does move freely.I don't know about exhaust valve I've not removed the header.I hope I've given you guys enough info to get an idea of how to fix it.with my my mods where's a good place to start with the pwk 35mm carb adjustments?I've got the a/f screw turned out one full turn as of now where's a good place to start?thanks for the help and very forum from what I've searched so far.
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Postby Julien D » 08:16 am Oct 02 2010

Sounds like an air leak to me. Pull the stator cover and look for oily residue behind there. While you have it off, grab the flywheel and see if it has any up/down or side/side play.
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Postby Tomm9050 » 12:44 pm Oct 02 2010

not and expert, but it might be running rich.

I just changed jetting (CGK, 40p 150M ) and it runs great so far.
1992 KDX 200; RB head; Fatty pipe; stock carb; Stock silencer

40 / 150 / CGK pos 3
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Postby Tomm9050 » 12:45 pm Oct 02 2010

(3rd clip)
1992 KDX 200; RB head; Fatty pipe; stock carb; Stock silencer

40 / 150 / CGK pos 3
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Postby Budget_89KDX » 02:42 pm Oct 02 2010

Ok I've been tinkering with it here's what I've found.no oil in the stator cover good news.I've got the jet needle on the second clip from the bottom what is raising in to the 3rd going to do?also if I screw the a/f all the way in the idle cleans up but its sluggish off idle and bogs and stumbles.sooooo what does that mean?rich on the pilot jet?
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Postby Indawoods » 02:47 pm Oct 02 2010

What jets?
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Postby Budget_89KDX » 04:28 pm Oct 02 2010

45/158
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Postby Indawoods » 08:07 pm Oct 02 2010

Drop that main to a 155 or 150... the pilot sounds OK....
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Postby Budget_89KDX » 11:49 pm Oct 02 2010

>|<>QBB<
Indawoods wrote:Drop that main to a 155 or 150... the pilot sounds OK....
ok but why go down on the main if the plug looks good?isn't the main for high speed running?isnt the pilot jet for lower rpms and idle?if I screw in the a/f needle and it clears up to a steady idle wouldn't that indicate pilot?I'm confused please explain?also what will going up to the third clip on the jet needle do?
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Postby scheckaet » 12:06 am Oct 03 2010

02 KX 200 hybrid: RB head and carb :prayer:
DRZ 400 SM :supz:

bike build: viewtopic.php?f=111&t=8245&hilit=bike+stable
bike profile viewtopic.php?p=30709#30709

newb info: viewtopic.php?f=77&t=12457#p117919
jetting guide: viewtopic.php?f=105&t=1156
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Postby Indawoods » 12:31 am Oct 03 2010

I have no idea of where you are at, your location or your elevation... You could be running fat or you could be running lean for all I know.

Your air screw should start at 1 1/2 out and adjust from there... read the jetting guide that is posted above to determine what is going on and how to remedy it.
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Postby Budget_89KDX » 05:46 am Oct 03 2010

I'm in illinois.
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Postby Indawoods » 08:58 am Oct 03 2010

Me too! :mrgreen:

My recommendations stand though... I believe your jetting issues are mainly air screw and needle adjustment...
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Postby Budget_89KDX » 01:40 pm Oct 03 2010

What part of illinois u in?
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Postby Indawoods » 01:48 pm Oct 03 2010

Decatur....
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Postby Julien D » 05:04 pm Oct 03 2010

well that's good then about the crank seal (behind the stator cover). Probably in the jetting, yes. And yes, it could be fat, or lean. Hard to tell from here :).

When you said it bogs off idle when you open the throttle, that makes me think "air leak". It also would make me think lean instead of rich. Which doesn't really add up with your jets, since 158 is huge.

155 or even a 150 is a better start point in any case. When you say it "bogs", does it sound hollow before it picks up, or does it like... stumble/sputter?

Are you sure on that compression? 190 is the very highest for usable range on the 89. I wouldn't really expect to see it that high unless the head has been milled or something.
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Postby Budget_89KDX » 06:07 pm Oct 03 2010

Used a quality gauge its a snap on I borrowed from a buddy.I don't know the history on the rebuild of this bike.the guy I bought it off of bought it from another guy that did the work but within a month of getting it he broke the jet needle and let it sit.it sounds hollow when it bogs I can't. Seem to find any air leaks I took carb cleaner around the reeds and boot as well as carb and no change in idle.I'm not sure its starting to irritate me I've never been stumped like this.
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Postby Budget_89KDX » 06:10 pm Oct 03 2010

>|<>QBB<
Indawoods wrote:Decatur....
no ****!I'm from decatur as well but moved from there to lovington a few years back.I'm in decatur all the time any chance we could meet up and you take a look and give your opinion on what to do?also where do you ride?we do a lot of country cruising.
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Postby Indawoods » 07:56 pm Oct 03 2010

Sure! We usually ride at South Fork in Taylorville.....
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Postby Budget_89KDX » 10:15 pm Oct 03 2010

When would be a good time to meet up I work m-f but I could loader up and bring it iin to town.or you're more than welcome to swing through my place if you're up for the drive?id like to get this thing running correctly before disassembly this winter when I strip it down to be powdercoated and resto modded.if your schedule permits maybe this weekend?appreciate it bro.
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