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  #1  
Old 01-17-2013, 10:25 AM
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Thumbs up 98 CR250R IS IT A REALLY BAD CARB?

     

I HAVE READ ON OTHER FORUMS THAT PJ CARB THAT COMES STOCK WITH 98 IS KNOWN TO FAIL. AND THAT THE BEST ONE WOULD HAVE TO BE AN 38MM PWK AIRSTRIKER. THAT COME STOCK FOR THE 2000 CR250. SO WOULD IT NOT BE JUST AS EASY AS ORDERING AN OEM 2000 CR250 CARB AND PUT IT ON MY 98 CR250.......
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Old 01-17-2013, 10:29 AM
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That's what I did with my 97. Motosport.com has them in stock. Works like a champ!
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Old 01-17-2013, 02:30 PM
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The carb on your 98 is a "boutique' model that Honda requested
from Keihin. It's a PJ in design, but a powerjet and TPS were
added in a failed attempt to use an ignition with 3D mapping.
That's the parts that fail.

The standard model PJ found on 90-96 CR250s and 89-01
CR500 is a decent unit that works fine. The PWKs that
were OE on the 99-00 CR250s is a step up and worlds better
than the TMXs that replaced them. The "air striker" version
adds a couple of strakes to the inlet to straighten the intake
charge.

If you are looking for a good swap without spending a lot,
find a used PJ from the model years I listed, slap a rebuild
kit on it and you'll be good to go. If you want a little more,
you can buy a new PWK from the two years I listed and change
the main jet and needle for cleaner running. Or buy a used
PWK and repeat the same process as the used PJ. Prices for
used ones are on the high side though, due to demand.

dogger
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Old 01-17-2013, 04:01 PM
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i made the swap on my 97, ordered a 2000 model pwk. works flawless. o yea, you wont find one any cheaper then here: Partzilla.com - OEM Powersports Parts from Honda, Kawasaki Polaris, Suzuki and Yamaha at discounts up to 80% off MSRP
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Old 01-17-2013, 10:44 PM
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Dogger your knowledge on on all things HPP cr250 is comprehensive to say the least. I never knew what the "3D" mapping was all about! The more I learn about these things (PWK in this case) the less I know.

Mine is a 98 cr250 with the stock PJ. So now i have a PWK from a '99 with the stock needle and an assortment of jets. I am headed to 29 palms tomorrow (1800' 50-60 degrees) to try it out and hopefully get it jetted.

I am planning on starting out with a 50 pilot/180 main. I have 48, 50 & 52 pilots and 168, thru 190 mains). I have the stock .5 slide and 1370D needle, 3rd clip.

You mentioned changing jets AND needles. I think I understand where the different jets will take me BUT I know nothing of the various needle & clip combinations. Any benefit to getting a stock '00 .7 slide & 715-289 needle?
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Old 01-18-2013, 08:23 AM
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Quote:
Any benefit to getting a stock '00 .7 slide & 715-289 needle?
None whatsoever. That needle was specified by Honda for the '00
(thus the non Keihin part number), and was on the fat side.

A better starting point would be a 1370 needle, 165 main and
a 55 pilot 3rd clip and 1 1/2 out on the airscrew. That's assuming
stock compression, premium pump gas and 32:1. The stock 5.0
slide is a good all around choice. With the cool temps and a little
altitude, take some extra mains (168, 170, 172).

29 Palms, sounds like a good day in the dirt. Have fun!

dogger
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Old 01-24-2013, 05:42 PM
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Dogger, update on the '99 PWK airstriker performance & jetting on my '98 CR250: Add me to the list of satisfied PWK customers! It performed exactly as advertized with better response off the bottom into the mid-range. The top end hook that the PJ does so well feels a little flatter but overall its easier to lay down the power especially on slippery surfaces.

At 2000' and 55 deg., I ended up with 52 pilot, 175 main, 1370D needle, 3rd clip, air screw 1-3/4. The 52 pilot may be a little fat, witnessed by the fact that I did not need to run the choke when stone cold but I just love the chunky-fat response down low --never hesitated or burbled just nice transition to upper pull.

I would like to get back some of the top end over-rev I had with the PJ so I may try going up on the main until it burbles then take it down 1 size. Either way, it's worlds better than the one dimensional mid-to top end pull of the PJ.

Thanks for the help Dogger!
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Old 01-24-2013, 08:43 PM
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Quote:
Add me to the list of satisfied PWK customers
Outstanding! The PWK strikes again.

Sounds like you have a good handle on the jetting too.

FWIW, I just found out the 99 version of the PWK has been
discontinued by Honda, so you probably got one of the last
ones...good timing!

dogger
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Old 01-25-2013, 02:44 PM
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The pwks I have used gave up nothing on top. You say you plan on going up on the main jet to gain some top end back. The other way is what you want to try. If your gloat is on 16mm the 52 pilot may seem rich depending in the weather. 45 is kind of the default we use.
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Old 01-26-2013, 07:00 PM
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Ossa: It will be another 2 weeks before i can get back out to try more jets. You may very well be right on heading leaner on the main. I will try both ways until I get that top end pull I enjoyed with the PJ.

As far as the 52 pilot, I know it is on the fat side -the no choke needed when stone-cold tells me that. I do remember reading one time that Jeremy McGrath liked his CRs jetted on on the fat side for the solid response when launching off jumps, etc. I'm no Mc by a HELL of along way but I do love boosting around with a chunky pull off the lower mid-range and this too-fat pilot seems to give me that. I will also try going a step or 2 leaner to see what that's like.

What I really want is to clone the super-responsive 03-07 RM250 low-end -transition to mid-range with the mechanically superior build, clutch, shifting and top end pull 92-01 CR250. All I want is perfection LOL!

Thanks for the input Ossa
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