How to "cut a slide"?

[Coyzter]

I hear of people cutting their carb slides for better performance. Does
anyone know the pros and cons of this, and where in the heck can I get some
info how to do it to my '95 WR250?! --
co...@SPAMSUCKSsisna.com
My effort to thwart "Spambots" requires you to remove
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[MXOldtimer]

Be careful, my buddy had a shop cut a slide for him for his 200 KTM with the
promise of major bottom end, it ran bad no matter what he did, so he had to buy
a new stock slide $ $ KTM dollars$ $

Doug

[end...@my-deja.com]

I cut the slide on my 01 CR 250. It is not too hard, but it is kinda
hard to explain in words. A couple weeks after I did it, an article
came out in Motocross Action that showed how to do it. I think it was
the issue from 2 months ago. You might want to look that up.

The only reason I cut my slide myself was because Honda is not selling
leaner slides then the stock one to the general public....so i had no
choice. Check to see if you can buy a leaner slide from your dealer. If
so, that is the way to go i think.

Before you cut it, you really need to be sure that is the right thing
to do to fix your jetting, and you also need to decide how much to cut
off. Remember if you cut off too much you cant glue it back on.

enduro8

In article <3a402...@news.sisna.com>,

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[Peter Lambert]

Cutting a slide changes the jetting( mixture) just off idle to 1/4
throttle.There is no reason to expect power increases by doing so.
In fact if the mixture is not correct at this point either too rich or lean it
may require adding material to the slide.
Best leave well alone if you are not sure of what you are doing.
Things like dirty air filters ,or worn crank seals or piston rings can have an
effect on performance .check these first
Pete

[John Klosterman]

Yep... I cut mine on my Keihin 38 oval slide (95 CR500 stocker).

The slide taper is measured in mm as the height of the arc at the back of
the slide.

It can be done best by buying, from a Keihin (or whomever) parts
supplier (e.g., std moto shop), the appropriate slide taper you wish
to try.

I modified one of mine on a Bridgeport type endmill machine.

I modified another using a scribe line parallel to the arc and
a nice carbide dremel cutting bit... by hand... blending followed
rough cut using a sanding drum.

Be sure not to damage the "front" (e.g., downwind) end of
'the slide.

On the 95 CR500... more slide taper seems to make for
a crisper low-mid and a slightly stronger hit and more
throttle response.

I only did it cuz a decent CR500 proficient mechanic/racer said I
should try it... I tried it and it seemed to make a noticeable difference
which I liked. I'm sure it varies from bike to bike and mod-to-mod.

I'm not sure how it works... but I "think" at small throttle openings
it increases the effective "nozzle angle" of air flowing over the
mainjet/needle. I think it might actually lean out the main jet
contribution at small throttle openings due to the change in
the momentum vector of the flow field (slightly less effective
pressure drop over the main orifice)... maybe becuz the airflow is
directed downward and kindof "into" the main jet orifice. This
is pure speculation on my part.

JK

[Dudley Cornman]

Cutting the slide is more of a jettig fix than a performance mod... although
proper jetting can seem like a major hop-up from poor jetting.

dsc

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