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Two-stroke tuning secrets: KTM powervalve set-up

If you have a KTM or Husqvarna 250 two-stroke, then altering the power delivery is as simple as changing the powervalve spring and setting it up right. But which spring do you choose and what difference does the adjuster make?

MotoHead’s chief tester Dave Willet runs through the different options and why one particular spring is not advised!

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