200 MXC jetting

SFO

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#1
Sorry to beat a dead horse but am going to my dyno guy to jet the mighty Fe_Princess 98 200 MXC and want to bring along all appropriate or requisite jets.

It has the EG BB and porting, Vforce reeds, Knarley pipe and Q silencer. (Which tested 82db at the Furnace HS)

Jetting now is stock needle, and slide cut 2mm.

Give me an idea of what brass to bring along with the needle of choice for linear 0~1/2 throttle openings...

Thanks in advance, if you have sudco availabilty instead of KTM part #'s that would be great.

Bill.
 
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#2
I had the EG 212 with more everywhere porting on my 2001 MXC 200. Could'nt get the thing to run in the midrange. Had good low and decent topend but flat in the middle. I even sent it back to EG with no luck. I went back to a stock cylinder with CEK 4th from top, 48 pilot, 188 main and it runs perfect. Good luck.
 

Strick

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#3
Altitude means nearly everything. Are you talking sea level? I like the CGH in that bike (maybe DDH). I like the __J in 300's and __K in 380's.
 

SFO

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#4
We go from sea level to 5 thousand feet.
The slide is a cut 7.
Let me know the needle of choices, pilot range, slide range, and the same with the main.
I am going to nail this spooge monster once and for all...
 

Strick

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#5
So you have a 9mm cut in the slide, taking it to a #9. Who did that? When you enter that into the equation, I doubt anyone on this board can give accurate advice on needle selection. I have used #6, #6.5, & #7. And used CGH, and CGK needles in the 200 with success, along with a N3__ yamaha needle that worked very will (double taper?).

That slide is so LEAN it is hard to even guess. I will humor you with speculation though, 48 minimum on the pilot, probably one turn out or less on the air screw. D_G needle (richer than the C needle in the lower throttle settings). AND, I still don't know if I am even in the ball park. Main - 185 or 188 with the single taper needles.

If you use KTM's jetting guide as a tool. You would be re-jetting the bike 3 times between 0' - 5000'.
 

SFO

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#6
I ordered another 6 which I can change into a larger cutaway if need be.
Please don't humor me...
I ordered a CEK, DDH, and a CGH.
I take full responsibilty for cutting the slide too.
Thanks for the help, I'll let you know how it turns out.
 

fishhead

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#7
Slide cutaway vs needle straight section diameter.

You will find that your results will cluster around 1mm additional cutaway equals one step leaner in straight section diameter in the 5 to 8 range. ddh and deh will put you in the ball park if it holds true above #8 cutaway. With a #6 slide try a dck-2 or ddk-3 or dck-3 with a 45-48 pilot and a 190main. These setting work well in a friends 98 200. with our current temps in the 55-70 range he likes the ddk-3 48p and 190 main at sea level to 3000ft for tight woods riding.

I found that rich straight sections and lean slides balanced better with leaner than normal pilots.

hope you get it sorted out.
 

SFO

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#8
this makes my head hurt...
I am on the path and thank god I have a grand national tuner looking over my shoulder whispering confidence inspiring nuggets.
I see we are kinda wacked out right now, 1398 needle, 40 pilot, cut 7 slide, 180 main.
No wonder she was getting 50mpg in baja....
 

fishhead

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#9
1398 needle? I hope you meant 1368. One more thing, gearing, it will affect your choice preferred jetting package. If you are looking for linear power. Try a 45 or 46 rear sprocket. The gereral consensus in this neck of the woods is the 45 is great for sea- level stuff but a little weak for the occasional foray above 5000 ft

Hope that helps
 

SFO

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#10
yeah yeah 1368, what is that needle all about?
I am running a 52t rear, BTW
 

fishhead

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#11
1368 equals C_J. There is a letter after the 68 that will describe the length. Perhaps an N, L, E, or D. The j diameter needles work pretty good with a 7 slide

The 98 and 99 have heavy flywheels and produce good torque so you can stack a bit more gear on them and jet a bit richer. First and second gear is stump pulling stuff with your current gearing. If a little more flywheel won't hurt try a set of steel clutch plates.

Just for fun you might try a nozi-2 or one of the noz_ series ktm needles with the cut slide and a 35-50 pilot and a 178 main. The super senior enduro guys like a lean pilot and the young bucks like a richer pilot. Most guys run a 50% blend of race gas such as c-12 or trick 100 no lead with premium pump.

They are great little bikes, the generator puts out a enough to run a good light, the power delivery can torque mild or rev wild and the chassis is pretty good stuff by todays standards. With a big bore you can probably ride it like a 250 and not rev it much at all on the trails
 

Strick

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#12
I truly hope you post back your results, and I am sticking by my guns, NO one on this board has used a #9 slide (Other than you). FYI, the newer KTM 125s are using a richer slide that prior years, not leaner.

I will lend you my #7 (shaved #6) to use if you want to try ANOTHER dyno run later, just bring it back to Reno in February.
 

SFO

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#13
I never really sat down and tried to wrap my head arroung the whole fuel delivery curve on this bike and do all the proper reseach.
I just guessed at changes to try to correct the throttle response and adress the mega-spooge.
I don't think what I did was the best solution now, just what I did.
My experience with cut away tuning has gross changes effecting a response unlike other aspects of carb tuning.
This jetting busines is stll kinda black art to me but I see why I didn't bite it off earlier, can't be any more arcane than cylinder heads.
Thanks for your patience, I am looking forward to optimizing Denises bike in time for her to sell it and buy the new Husky TE250 at her shop...
 

SFO

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#14
I just realized all the old PJ needles form the 90250 will work too...

This is what I have all together then...
Brass in hand, 35~55 pilots
150~ 190 mains
CEK, DDH, CGH, R1464J, R1366N, R1466J NEEDLES

#6 SLIDE
 

fishhead

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#15
just curious after re-reading your post what the stock needle was that you were referring to in the originar post. My info lead me to believe it would be a nozg.