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Old 07-06-2012, 09:20 PM
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Exclamation 2001 kx250 is running very rich no matter what

     

hey there. so i had a problem with my spark plugs getting wet with fuel but i fixed that by adjusting my float level. Someone told me that the stock float level for my bike should be 6.5mm +/- 1mm, but where the float is now it is around 14mm ish. The bike is starting first kick and is smoking a whole lot but the plugs are black. The bike runs fine, only thing i noticed is that when i go from neutral to 1st and i give her,she kinda hesitates then the power kicks in... is this normal? should i raise the floats more? please help
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Old 07-06-2012, 09:35 PM
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What carb is on your bike? The manual for 03-04 kx250 calls for a float level of 6.5mm (pwk38s). Check out the thread on how to set your float level and make sure you are doing it right. You should get a manual for your bike too.
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Old 07-06-2012, 09:38 PM
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i believe i have the same carb on my 01 kx250. the thing is when its set to 6.5mm level im fouling plugs and my bike wont even start.. im forced to bump start it and it will become very smokey. so raised the level to 16mm ish and it runs ok but plugs are showing im running to rich still

Last edited by KawasakiLover; 07-06-2012 at 09:49 PM.
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Old 07-06-2012, 10:06 PM
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The info here says 16mm for pwk38.



Keihin Carburetor Tuning
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Old 07-07-2012, 06:55 AM
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You need to get the model number of your carburetor. It should have a number stamped on the side.
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Old 07-07-2012, 09:03 AM
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Running rich, apart from the float level reeds or a burst oil seal crank side. Have you excluded those?
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Old 07-07-2012, 12:24 PM
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i checked the reeds and they were in perfect condition. i havent checked if there is a problem with the seal but i wouldnt think that would cause this problem... wouldnt it smoke alot it there was a leak?

---------- Post added at 02:24 PM ---------- Previous post was at 02:00 PM ----------

ok i do believe it is a pwk38. i will try the measurements you gave me and give her a run. thanks for your help
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Old 07-07-2012, 02:26 PM
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Depending how big is the leak actually. Mine leaked just a bit, it actually raised the pressure in the gear box and I lost tranny oil through the breatherline.
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Old 07-09-2012, 01:58 PM
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Black, fouled plug indicates a leaking main seal on the clutch side. You will forever be chasing your tail and compensating with jetting what needs to be fixed mechanically, first.

Replace both seals and check the bearings for any play. Return your carb settings back to stock and then see where you are at.

Are you using air filter oil or motor oil on the air filter?
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Old 07-09-2012, 08:24 PM
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Quote:
Originally Posted by Randog Leader View Post
Black, fouled plug indicates a leaking main seal on the clutch side. You will forever be chasing your tail and compensating with jetting what needs to be fixed mechanically, first.

Replace both seals and check the bearings for any play. Return your carb settings back to stock and then see where you are at.

Are you using air filter oil or motor oil on the air filter?
Black fouled plugs doesn't mean its 100% crank seal leak. It just mean to much oil/gas mix isn't getting burned fast enough aka rich...

First off make sure your air filter is clean. A dirty air filter is a very common way to run rich.

I don't have a manual for your carb but before assuming its the crank seal I would pull the carb apart blow all the passages, and verify the float height and jets. Then remove the float needle and see if there is a worn down ring around the viton tip. Worn out needle valve and seats will cause a rich mixture.

Good luck!
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Old 07-09-2012, 09:25 PM
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ok heres the dealio. i was playing with the floats and i set them up at around 10mm. if i set them to 16mm no gas is getting into the bowl, and if i set it to 6.5mm way to much gas is getting into the bowl which causes my plugs to be very black and wet with gas. so a 10mm the bike starts first kick and runs ok, doesnt trying wheelieing like crazy which im kinda concerned about, but the plugs are still some what black but arent wet and in some spots its a brown. Any Ideas on whats up?
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Old 07-10-2012, 06:14 AM
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Not a float problem. Start by making sure your air filter is clean, then check the main seal on the clutch side. After that make sure your jetting is right for your application. If all of that fails, you're probably not on the gas enough!
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Old 07-10-2012, 09:52 AM
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could it be my clip positioning?. my bike doesnt seem to be pulling up as hard as people say its supposed to be.i physically have to pull up to get into a wheelie position but people are saying my kawi is supposed to pull up by its self, at the point where i have to push the front down alot. Could my clip position be to low? should i try raising it one to help lean out the condition and maybe that will help me with my dark spark plug problem?

I really just wanna get on the bike and expect what i expected, CRAZY POWER
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Old 07-10-2012, 10:34 AM
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That depends also on your gearing ratio, the bigger up front or the smaller in the back the more you got to pull it up.
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Old 07-10-2012, 10:48 AM
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when you guys say "the main seal on the clutchside" is that the clutch seal or what is the proper name for that seal? wouldnt a bad seal thats letting oil in cause more smoking than usual?
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Old 07-10-2012, 10:51 AM
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Yes, indeed. It is called the crank seal. It is on the "Clutch" or "Wet" side. It will cause rich conditions with smoke and fouled plugs. Also, extra splooge comes out of the silencer and pipe, in most cases.
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Old 07-10-2012, 10:59 AM
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my bike doesnt seem to be smoking as much either and there is only a small amount of oil on the tip of my pipe (which i think is normal for any 2-stroke). But i might as well replace it anyways since it was sitting for a while before. Thanks for your patience guys.
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Old 07-10-2012, 02:14 PM
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Yes, a little "drool" is common.

You are smart to go ahead and replace those seals (Left and Right) as well as check the crank bearings by trying to move the crankshaft up and down (shouldn't move at all) so that you can rule out any mechanical issues before attempting jetting changes. Crankshaft should be rebuilt every 2-3 seasons on 250cc and sooner on 125cc and 80-85cc bikes. Bottom ends don't last forever. This is where most people go wrong. They will alter the jetting to get the biking running "better" but this is only compensating for a mechanical issue and so it will never be "right". Worse yet, once the mechanical issue is either fixed or completely fails, the jetting changes that were made can have an adverse effect and could possibly cause more harm than if left alone.
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Old 07-10-2012, 03:29 PM
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The float level on your 2001 kx250 is 6.5mm. If you are setting the float 4mm-10mm off, you are either doing it wrong or measuring wrong.
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Old 07-10-2012, 03:47 PM
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ok as soon as i order the seals and get them im gonna replace them then check the bearings and then return my jetting to stock and work from there. hopefully i can get this bad boy up and runnin and take it for a nice long spin. thanks everyone

---------- Post added at 05:47 PM ---------- Previous post was at 05:42 PM ----------

hey one last question, will these work?
2001 Kawasaki KX250 Pro X Crank Seals | MotoSport

and i just need two of them? one for the left and one for the right side?
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