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  #1  
Old 06-22-2009, 11:05 AM
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Default 2001 CR250 carb sucks

     

I tell ya,i just picked up the bike and right away i noticed how rich the thing runs.It has sludge comming out of the pipe where it goes into the motor.Is there an easy way to fix this?Also the thing just will not idle.Im going to go through it and clean everything up real good but has anybody had any luck with this carbs idle?I have a cr85 also and a blaster and the pwk carbs seem to be easer to adjust then this thing.What would be a good replacement carb?99cr250 carb?
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Old 06-22-2009, 12:32 PM
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Your bike came equipped with the cantankerous Mikuni TMX,
the only dud on an otherwise stellar motor.

A very good option would be to swap a Keihin PWK Air Styker.
The PWK was standard equipment on the 2000 CR250. You
could probably find a decent used one for under $50 or you
can buy a new one already jetted from Honda for $168.

Either way, you will find it much easier to set up, and your bike
will run like it is supposed to, for a change.

dogger
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Old 06-22-2009, 01:39 PM
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Thanks man.New to the whole 250 thing.Got the bike for 1800 and is in really good shape.Need to find out some info also on the power valve on how to clean it out a little.Could you just take the cover off and spray some carb cleaner in there or is there another easy way?Thanks again
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Old 06-22-2009, 03:14 PM
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No "easy way" to clean the power valve. Honda recommends you
decarbon the valve every 7.5 hours of use. Most people stretch
that to every 75 hours of use, if that often.

The first thing I would get is an owners manual and a service manual.
You can get both at: http://www.helminc.com

There is a nice detailed description on how to service and adjust the
power valve. One "tip" I can pass on, is to use oven cleaner to remove
the carbon buildup on the flap and sub-exhaust valves. Remove the
parts and place them in a tub and soak them with oven cleaner from
an aerosol can. Let stand for a couple of hours and wipe the carbon
off. Then clean any residue off with a solvent based cleaner and they
should look and perform like new.

dogger
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Old 06-22-2009, 07:45 PM
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Thanks alot
i have a pic of it located here
2001 cr250 pic - E2S
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Old 06-24-2009, 07:33 PM
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i sure would like to know where you guys get new pwk carbs for 168.00?? i see this on posts all the time, no way no how can you get one for 168.00 new they are just under 300.00 from honda and a used one on ebay goes for 100-150 all day long and i have one for sale complete carb to throttle for 150.00 right now off my 2000 I had carb issues on my 01 and after some re-jetting it runs killer!!
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Old 06-24-2009, 08:50 PM
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just got one from ebay,like new.payed 110$.Now i need to know what jets to get
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Old 06-25-2009, 05:03 PM
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jetting depends on what year carb you actually got if its off a 2000 main jet is 178 if you run fmf pipe
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Old 06-25-2009, 06:34 PM
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Quote:
Originally Posted by 1motoman69 View Post
i sure would like to know where you guys get new pwk carbs for 168.00?? i see this on posts all the time, no way no how can you get one for 168.00 new they are just under 300.00 from honda and a used one on ebay goes for 100-150 all day long and i have one for sale complete carb to throttle for 150.00 right now off my 2000 I had carb issues on my 01 and after some re-jetting it runs killer!!
Try Service Honda.

PWK Carb invoice price

Last edited by KKXR400R; 06-25-2009 at 06:42 PM.
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Old 06-25-2009, 07:11 PM
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Quote:
have one for sale complete carb to throttle for 150.00
You may be able to get that much if the buyer doesn't know they can get
a new one for $168 from Honda.

dogger
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Old 06-25-2009, 07:30 PM
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Hi guy, dogger is right about the oven cleaner for the carbon,just make sure your wearing glasses . dont want that stuff in your eyes!!...Coming fom the voice of experence here!......Jerry
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Old 06-25-2009, 07:45 PM
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They are 216 new on Motosport, but we all know how used parts go. For example, a set of forks is over $1500 new and you will be lucky to get $300 used. I had a pwk carb off of a '99 I put on ebay and got a whopping $68!!
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Old 06-25-2009, 09:16 PM
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Quote:
dont want that stuff in your eyes!!...Coming fom the voice of experence here!
OUCH! Jerry. That doesn't sound like much fun.

dogger
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Old 06-26-2009, 10:07 AM
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Quote:
Originally Posted by bundyho1 View Post
I tell ya,i just picked up the bike and right away i noticed how rich the thing runs.It has sludge comming out of the pipe where it goes into the motor.Is there an easy way to fix this?Also the thing just will not idle.Im going to go through it and clean everything up real good but has anybody had any luck with this carbs idle?I have a cr85 also and a blaster and the pwk carbs seem to be easer to adjust then this thing.What would be a good replacement carb?99cr250 carb?
I had real good luck with the Mikuni, just bought the JD kit and that was it.
380 main, red needle, clip on the 4th from top, 4s nozzle, 25 pilot air screw at 2 5/8 and idle screw at 1/4" threads showing past lock nut.
$75
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Old 06-27-2009, 07:14 AM
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Well her is my update.First the 38 pwk that i got is a newer carb.Not one from the 2000 cr.Whats the difference?Also i ordered a jet needle from a 1999cr250 to go in it.Also after messing around with the Mikuni and cleaning it out a little it does seem to be running better.What im going to do now once i get the airstriker is give it a try and see how it feels and runs.If it doesnt feel any better than the mikuni then i will switch back and get the jd kit.
Also my intake boot looks cracked,im wondering what years works on the 2001 model?97 -01 ?
Im at about 900ft above sea level and rid in temps from 50s to 90.If anyone has anymore info for me thanks

Last edited by bundyho1; 06-27-2009 at 07:26 AM.
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Old 06-27-2009, 10:54 AM
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It doesn't matter what year your PWK is. Except for jetting, they are all
the same (unless you managed to get one with an electric power valve).
As for jets, I would use the same jetting that came in the 2000 PWK from
Honda as a baseline. That motor is the closest to yours in port timing.
Maybe someone here can supply you with that info.

Remember, the PWK won't make your bike faster than the TMX. It's
advantage over a stock TMX is better tuneability, crisper response and
a cap that doesn't require a PhD in patience to remove/install. Speaking
of caps, if I remember correctly, you will need to change your throttle
cable to a 2000 in order for the cable end to fit the PWK.

If you decide to stay with the TMX, I definitely recommend the JD kit.

Finally, I'm willing to bet the crack in your inlet boot is causing most of
your problems.

dogger
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  #17  
Old 06-27-2009, 11:08 AM
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Thanks im going to tear it down when i get the new carb,i just hope i dont need a new cable.Also looking for a used carb boot on ebay,just wondering what years i can get?
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  #18  
Old 06-27-2009, 11:26 AM
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Here the ghetto way of fixing your boot -
wipe it down with alcohol , then coat the sum***** in RTV , and let dry . I did this on a old gs750 and it worked wonders .
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Old 06-27-2009, 12:47 PM
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Smile

Yea i already got sum,im going to do that until i can get another one.
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  #20  
Old 06-27-2009, 01:02 PM
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Quote:
Originally Posted by bundyho1 View Post
Well her is my update.First the 38 pwk that i got is a newer carb.Not one from the 2000 cr.Whats the difference?Also i ordered a jet needle from a 1999cr250 to go in it.Also after messing around with the Mikuni and cleaning it out a little it does seem to be running better.What im going to do now once i get the airstriker is give it a try and see how it feels and runs.If it doesnt feel any better than the mikuni then i will switch back and get the jd kit.
Also my intake boot looks cracked,im wondering what years works on the 2001 model?97 -01 ?
Im at about 900ft above sea level and rid in temps from 50s to 90.If anyone has anymore info for me thanks
bundyho1 do you know what bike your PWK came from? The PWK from the 00' is the old style which has a twist on top, shown here. Honda Motorcycle Parts, Kawasaki Motorcycle Parts - Beaver Dam WI
The new style uses a top retained by 2 screws (similar to your TMX).
Indiana Suzuki Kawasaki Yamaha KTM Motorcycle ATV Dealer - Flat Out Motorcycles - Aprilia & Scooters

The newer style is reported to be shorter in distance from the inlet to the outlet than the older style. If I remember right the float settings between these 2 carbs is also different. Most of the newer style PWK's I've seen come with some type of electrical wiring (similar to what you see in the link). However KTM's been using a 36mm version of this newer style PWK carb without the electronics for several years now. As far as I know the jets, needles, and slides are interchangeable between the newer and older style PWK's.

FWIW I haven't had any trouble getting the TMX to idle. But I'm with you in thinking that it is jetted way too rich in stock form.
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