Super rich, impossible to jet help please

[ncdogman]

Ya I'm beginning to not like the KDX line. My YZ, CRF, or Big Bear 400 has given me no issues. The worst thing, guess why I still have this green booger, when I had to drive 5 hours to pick the KDX up, I blew up my Nissan truck, and had to buy a new truck. Was an awlful day that day. Left the house at 6am on a Sunday, didn't get home till 3 am Monday morning!!! This dam green machine has a curse on it!!! Anyone want the piece of crap?? LOL

[KDXGarage]

"Ya I'm beginning to not like the KDX line."

You have a carburetor issue, not a KDX issue. That is the same as if I said you had a Nissan issue, not a "whatever the root cause was" issue.

Getting a Ford or a YZ won't fix either.

Older YZ's came with PWK Keihin before air stryker.

You have a 19 year old bike with 19 year old bike problems.

[treelimb]

"Ya I'm beginning to not like the KDX line. My YZ, CRF, or Big Bear 400 has given me no issues. The worst thing, guess why I still have this green booger, when I had to drive 5 hours to pick the KDX up, I blew up my Nissan truck, and had to buy a new truck. Was an awlful day that day. Left the house at 6am on a Sunday, didn't get home till 3 am Monday morning!!! This dam green machine has a curse on it!!! Anyone want the piece of crap?? LOL"


YES SIR I want it. Are you within 200ish miles from Cedar Bluff,Alabama? I'll come get it Friday.
So I am having super rich carb issues as I type this. Ordered and just got a jet block gasket which should clear mine up. My KDX is a 1997 but virtually everything on it is new. Carb rebuilt. Making BR7 plugs wet. She is very tight and I've had her or she's had me going on 13 years,maybe longer.I could never get rid of her. You get yours straightened out and your entire perspective will change. My issue is close to being resolved.

[ncdogman]

Ya I'll probably have a different thought when I put the new carb on. So now the question is do I buy the air stryker, or keep it the PWK35 non air stryker? Thoughts on that? It's only $10 difference.

[ncdogman]

It's having typical jet block gasket symptoms, but that did not clear it up. Please post what happens to yours when you change the gasket. I'm wondering if your about to chase the same problem I am having.

[KDXGarage]

I sure as heck hope not, as I will be helping him work on it over and over. :-)

I would go air stryker. You won't have the same setup as others, but what good has that done you this time around. :-)

[ncdogman]

Everyone says that the air stryker is much better then the non air version. Good thing is I have the entire range of jets and needles that are genuine keihin, so the only cost will be the carb.

[ncdogman]

One more stab at this maybe this will help someone else, or possibly me. I really do not notice any difference when I pull the choke knob when it is running. What is the mechanics of the choke system. Every other bike I check choke operation, when I apply choke with engine warmed up, it falls flat on its face, and loads slam up. The KDX, it runs the same, or pretty dam close to the same. I pulled the choke knob out, and everything clicks like it should, and moves like it should. I HATE running from this problem, rather then finding out what is causing it.....It's driving me CRAZY!!!

[KDXGarage]

What is the air screw at?

[John_S]

Yeah sorry to hear you're still having to mess with it. The only other things I could think of would be the slide, or the choke rubber piece not sealing up good so its on partial choke. That could explain running good with such a small main jet. I had a PWK 36 that would spray anything that was behind it with oil at, or near idle. Revved out just fine. Finally got tired of messing with it and bought a 38 air striker. Swapped the slides which were the same number and the 36 idled so high I had to shut it down right away. Kicked the idle down and it was perfect. So it ended being a worn out slide that physically looked good.

Those things I mentioned on the earlier posts about polishing the seat and setting the float height to 18mm was what I had to do to my brand new 35 air striker from Jets R Us before I could get my 220 to run right. I'd come out in the morning and have a big puddle of gas under the bike. I was so frustrated. Once you run gas through it, there are no returns. I was convinced that I had a defective carb. Its been good for a couple years though.

[ncdogman]

UPDATE: Got the 35mm Air Striker, installed a 40 pilot, and 150 main. DEK needle on middle clip #4.5 slide. Thing is a beast. Will stand up when you roll on the throttle. Does not load up. Idles just fine. Air screw at 2 turns out at 80 degrees and 3000' elevation. Getting awesome mileage. Problem fixed!!!!! Going this Wednesday to try it out on the OHV trails, tight single track. Seems we have another KDX brought back from the dead.

[kdxsully]

Just needed to clear its throat.

[KDXGarage]

SWEET! Enjoy that KDX!

[daveovington]

I realize that this is a super old thread but I've been having a major problem with the float height setting on my 83 kdx250. I've finally got my clutch working amd went to take it for a rip and it's running super rich, when I snap the throttle it doesn't want to get up and go, it's super sluggish and has alot of smoke coming out the pipe. I've tried to set the float to the specified height for this damn thing which says 16mm or something like that, but when I try to do that the float won't go that high. When I adjust it, it hits the top of the bowl before it gets to the specified height and if I leave it at that height it drains fuel out of the overflow even just sitting there and not running. So what height should I set it at? Is there a level that the fuel should be in the bowl so I can set it to shut at that height ? I'm at a loss, amd now that I've gotten it to the point that I can ride it I have this problem.!!! Grrrrr! Old thread or not I could sure use some help here. Ty in advance

[SS109]

I realize that this is a super old thread but I've been having a major problem with the float height setting on my 83 kdx250. I've finally got my clutch working amd went to take it for a rip and it's running super rich, when I snap the throttle it doesn't want to get up and go, it's super sluggish and has alot of smoke coming out the pipe. I've tried to set the float to the specified height for this damn thing which says 16mm or something like that, but when I try to do that the float won't go that high. When I adjust it, it hits the top of the bowl before it gets to the specified height and if I leave it at that height it drains fuel out of the overflow even just sitting there and not running. So what height should I set it at? Is there a level that the fuel should be in the bowl so I can set it to shut at that height ? I'm at a loss, amd now that I've gotten it to the point that I can ride it I have this problem.!!! Grrrrr! Old thread or not I could sure use some help here. Ty in advance

Dave, for future reference, it's way better to start a new thread than to post in a dead thread as you will get more eyes on it. Also, make sure you're posting in the correct sub-forum as the carb for an '83 KDX250 is not the same as any '95+ KDX 200/220. Thanks.

[kdxdazz]

On older worn out carbs you have to set the float height using the clear tube method, numbers don't apply when floats are bent,worn, twisted

[daveovington]

On older worn out carbs you have to set the float height using the clear tube method, numbers don't apply when floats are bent,worn, twisted

Awesome man, ty so much I was just setting it as close to the spec I was shown as I could, which basically means right to the top lol. I'll set it down to the proper height in the next day or 2 and post results in a new thread lol

[daveovington]

I realize that this is a super old thread but I've been having a major problem with the float height setting on my 83 kdx250. I've finally got my clutch working amd went to take it for a rip and it's running super rich, when I snap the throttle it doesn't want to get up and go, it's super sluggish and has alot of smoke coming out the pipe. I've tried to set the float to the specified height for this damn thing which says 16mm or something like that, but when I try to do that the float won't go that high. When I adjust it, it hits the top of the bowl before it gets to the specified height and if I leave it at that height it drains fuel out of the overflow even just sitting there and not running. So what height should I set it at? Is there a level that the fuel should be in the bowl so I can set it to shut at that height ? I'm at a loss, amd now that I've gotten it to the point that I can ride it I have this problem.!!! Grrrrr! Old thread or not I could sure use some help here. Ty in advance

Dave, for future reference, it's way better to start a new thread than to post in a dead thread as you will get more eyes on it. Also, make sure you're posting in the correct sub-forum as the carb for an '83 KDX250 is not the same as any '95+ KDX 200/220. Thanks.

Thank you I will do that from now on. I'm not really used to these types of forums.

[SS109]

Thank you I will do that from now on. I'm not really used to these types of forums.

No worries my man. Just want to make sure you get the info your after!