BIG jetting changes 2019 KTM 250sx

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6/5/2018 8:20 AM

FYI
Pilot goes to 35 from 42.5
Main goes to 450 from 440
Needle goes wayyyy rich, 6BFY42-71 from 43-73
needle jet stays same S-1

just an fyi

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6/5/2018 8:26 AM

Hopefully it works

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vomiting equals disqualification.

6/5/2018 9:01 AM

The slide made the biggest change on my bike, I wonder if that changed too.

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2018 KTM 250sx
Instagram CamaroAJ

6/5/2018 10:20 AM

Those are steps in the right direction, the 17 &18"s which share the same jetting, are too rich on the pilot & too lean on top...

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6/5/2018 4:39 PM

43-71 lean needle 43-73 rich needle ?

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[Moto D Racing

6/5/2018 4:47 PM

43-71 is richer
Second number is the diameter

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6/5/2018 5:01 PM

thanks on needle info

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[Moto D Racing

6/5/2018 5:13 PM

Only missing ingredient is the slide, manual doesn’t specify
Needed info should be in your manual in the tuning engine chapter , good chart of rich to lean needles

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6/19/2018 11:10 AM

Nice! Further validates all the changes that we collectively made on the 17's and 18's. I dont get how you develop a new bike and not spend a few days getting the jetting sorted out before delivery. Blows my mind.

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6/19/2018 3:15 PM

KTM just copies you all. LOL

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5/18/2019 8:56 AM

Bumping this. Has anyone here had any luck determining which jetting, needle, slide mods that the 19 responds to well? Same as the 17-18? Thanks!

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5/18/2019 5:00 PM

JohnMatrix wrote:

Bumping this. Has anyone here had any luck determining which jetting, needle, slide mods that the 19 responds to well? Same as the 17-18? Thanks!

Same as the 17-18’s.

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2018 KTM 250sx
Instagram CamaroAJ

5/19/2019 6:35 AM

Thanks AJ!

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5/20/2019 6:17 AM

what pre mix ratio you guys running?

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Instagram @_yabba_dabba_dont_


5/20/2019 6:48 AM

Slosh 112 wrote:

what pre mix ratio you guys running?

With T2 mixed 40:1 or u4.4 mixed 44:1 with amsoil dominator
MJ 490
PJ 37.5 (when cooler out, below 65*) 35 when above 65*
AS 2.0 turns out
NJ S-4
Needle 42-75 3rd clip
Slide 5.75
PV 1.75 turns in


With C12.
MJ 460
PJ 32.5
AS 2.0 turns out
NJ S-4
Needle 42-75 3rd clip
Slide 5.75
PV 1.75 turns in
Straight C12 mixed 60:1 with amsoil dominator

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2018 KTM 250sx
Instagram CamaroAJ

7/2/2020 3:37 PM

Anyone have any jetting specs for the 2019 250 sx yet? Ive been riding it bone stock and it wasnt bad but today was the first hot day of the year here in ny, 92 and humid, and the bike was pretty lean. Looking for some tips for a warmer weather setup.

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7/2/2020 4:30 PM

Dannyderasmo106 wrote:

Anyone have any jetting specs for the 2019 250 sx yet? Ive been riding it bone stock and it wasnt bad but today was the first hot day of the year here in ny, 92 and humid, and the bike was pretty lean. Looking for some tips for a warmer weather setup.

Hot & humid conditions should make your jetting richer not leaner...

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7/2/2020 5:16 PM

My current setup is 5.75 slide, S-1 needle jet (stock), 17-62 needle (suzuki needle) and 35 pilot (stock) and 450 main (stock) with a bills system. Bike has been running really well in all California weather conditions. Tried a 40 pilot and it was too rich. I'm about 1.5 turns out on the air screw.

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7/2/2020 6:58 PM

Dannyderasmo106 wrote:

Anyone have any jetting specs for the 2019 250 sx yet? Ive been riding it bone stock and it wasnt bad but today was the first hot day of the year here in ny, 92 and humid, and the bike was pretty lean. Looking for some tips for a warmer weather setup.

https://m.vitalmx.com/forums/Tech-Help-Race-Shop,42/KTM-HUS-125-150-250-jetting-thread,1363394

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2018 KTM 250sx
Instagram CamaroAJ