Keihin PWK slide #7 for the hard to jet '03 RM250

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5/22/2018 7:00 AM

My buddy has the infamous 2003 RM250 that is notoriously difficult to jet. The reason why, supposedly, is that Suzuki used a 6.5 slide in the bike's PWK carb that year (which, according to MXA, was the wrong one?)

From what I gather after reading many posts and write ups about the issue, the ultimate fix is to replace the slide with a #7 and go a little leaner on both Main and Pilot jets (and either adjust the needle clip, or go with a new needle that's one or two sizes leaner). Bike will be ridden around 500ft-1000ft elevation and running 40:1 50/50 mix

I see the #7 slide available from JD, Sudco, etc for around $70... but would another option be to just use the slide from a bike that came with a #7 slide, such as the 2004+ RM250, or a YZ250? I feel like the answer to my question is an obvious one, but still would appreciate any feedback from folks who have been there done that

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Positively, absolutely 110% obsessed with anything MOTO.

5/22/2018 8:11 AM

Yes. Just order a 04 or 05 rm250 slide. They're different part numbers I think because one has a small slit cut in the bottom. 05 I think?

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5/22/2018 9:25 AM

Modify the stock slide into the one you want.

https://thumpertalk.com/forums/topic/492565-yz250-squish-clearance/?page=16

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Can't imagine it's that big of a hassle to jet around that slide. What needle is it using?

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5/22/2018 9:37 AM

We just recently helped another guy out with an 03' RM250 in this thread. https://www.vitalmx.com/forums/Tech-Help-Race-Shop,42/RM-250-Jetting-Question,1333881 and he seems pretty happy.

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5/23/2018 2:36 PM
Edited Date/Time: 5/24/2018 7:35 AM

I own an 03 and started the above thread. I sent my slide to RD designs and my head as well. I think cutting the head was like 75 bucks and cutting the slide to a 7.0 was 20 or something. The combo of those two it runs great. Can still run with pump gas. Im at 5000 ft elev. but im running 162 NECH second clip 7.0 slide and 45 pilot.

All I know is what ever I did it runs great now.

Where in the rpm is he having the issue? I was having it right about 3/8 ish

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