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mxaniac

SX vs SXF AER valving

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The 250 SXF seems to have a much more sophisticated shim stack than the SX.  The SX has a check plate instead of a compression stack on the midvalve.  Anyone know or have an educated guess why this would be?  Can anyone comment on the difference in feel between the 2?  The difference between the 250 350 450 SXF perplex me as well as the only difference appears to be 13 basevalve face shims on the 250, 11 on the 350, and 15 on the 450.

2018 examples:

1522305733_2018250SXEU.jpg.8d9209d9b1bcb0c6e9f73a31d7628477.jpg

774513643_2018250SXFEU.jpg.e685b80448f011f5c4084e7307a0c1c3.jpg

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Ktm imo felt the lighter 2 strokes don't need the full midvalve

And for most riders it works good ,if they out ride the midvalve a soft version of the sxf one can be used

I liked 0.3mm of float on the mid

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Seeing that the 350 which is a heavier version of the 250 has less face shims than the 250 and then the 450 has more makes me wonder if KTM has a bunch of drunken monkeys doing the valving or if they have a super sophisticated double top secret proprietary model that includes factors such as:

Weight bias

Engine torque

Engine compression braking

Bike weight

Rear linkage profile

Rear tire size

Swingarm length

Or maybe the just had a typo.

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Vet riders on 350. Trying to make it more compliant for the majority type of purchasers that scoop up the 350

  • Haha 1

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2 hours ago, hondaman331 said:

Does anyone know the difference in stacks between an xc and a sx 2 stroke model 2019?

I've not tried but I'm told you can call White Power North America at (951) 319-3300 to get that information.

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